View source for 173 (number)

{{Infobox number
| number = 173
| factorization=[[prime number|prime]]
| prime=40th
| divisor =1, 173 
}}

'''173''' ('''one hundred [and] seventy-three''') is the [[natural number]] following [[172 (number)|172]] and preceding [[174 (number)|174]].

==In mathematics==
'''173''' is:
*an [[odd number]].
*a [[deficient number]].
*an [[odious number]].
*a [[balanced prime]].<ref>{{Cite web|url=https://oeis.org/A006562|title=Sloane's A006562 : Balanced primes|website=The On-Line Encyclopedia of Integer Sequences|publisher=OEIS Foundation|access-date=2016-05-26}}</ref>
*an [[Eisenstein prime]] with no [[Imaginary number|imaginary]] part.
*a [[Sophie Germain prime]].<ref>{{Cite web|url=https://oeis.org/A005384|title=Sloane's A005384 : Sophie Germain primes|website=The On-Line Encyclopedia of Integer Sequences|publisher=OEIS Foundation|access-date=2016-05-26}}</ref>
*a [[Pythagorean prime]]
*a [[Higgs prime]]
*an [[Isolated prime|Isolated Prime]]
*a [[Regular prime|Regular Prime]]
*a [[Sexy prime|Sexy Prime]]
*a [[Truncatable prime|Truncatable Prime]]
*an inconsummate number.<ref>{{Cite web|url=https://oeis.org/A003635|title=Sloane's A003635 : Inconsummate numbers in base 10|website=The On-Line Encyclopedia of Integer Sequences|publisher=OEIS Foundation|access-date=2016-05-26}}</ref>
*the sum of 2 squares: 2<sup>2</sup> + 13<sup>2</sup>.
*the sum of three consecutive [[prime number]]s: [[53 (number)|53]] + [[59 (number)|59]] + [[61 (number)|61]].
*[[palindromic numbers|Palindromic number]] in bases 3 (20102<sub>3</sub>) and 9 (212<sub>9</sub>).
*the 40th prime number following [[167 (number) |167]] and preceding [[179 (number)|179]].

==In astronomy==
* [[173 Ino]] is a large dark [[Asteroid belt|main belt]] [[asteroid]]
* [[173P/Mueller]] is a periodic [[comet]] in the [[Solar System]]
* [[Arp 173]] (VV 296, KPG 439) is a pair of [[galaxy|galaxies]] in the [[constellation]] [[Boötes]]
* [[Kosmos 173]] was a soviet union satellite
* [[NGC 173]] is an unbarred [[spiral galaxy]]

==In the military==
* [[173rd Air Refueling Squadron]] unit of the [[Nebraska Air National Guard]]
* [[173rd Airborne Brigade Combat Team (United States)|173rd Airborne Brigade Combat Team]] of the [[United States Army]] based in [[Vicenza]]
* [[173rd Battalion (Canadian Highlanders), CEF|173rd Battalion]] unit of the [[Canadian Expeditionary Force]] during the World War I
* [[173rd Special Operations Aviation Squadron]] of the [[Australian Army]]
* [[Russian submarine K-173 Chelyabinsk|K-173 ''Chelyabinsk'']] [[Russian Navy|Russian]] {{sclass2|Oscar|submarine}} 
* {{USNS|Provo|T-AG-173}} was a [[United States Navy|U.S. Navy]] ''Phoenix''-class auxiliary ship following World War II
* {{USS|Codington|AK-173}} was a U.S. Navy {{sclass|Alamosa|cargo ship}} during World War II
* {{USS|Eldridge|DE-173}} was a U.S. Navy {{sclass|Cannon|destroyer escort}} during World War II
* {{USS|Etamin|IX-173}} was a U.S. Navy {{sclass|Crater|cargo ship|2}} during World War II
* {{USS|Florence|SP-173}} was a U.S. Navy [[yacht]] during World War I
* {{USS|Hyde|APA-173}} was a U.S. Navy {{sclass|Haskell|attack transport}} ship during World War II
* {{USS|PC-472}} was a {{convert|173|ft|m|adj=on}} U.S. Navy [[submarine chaser]] during World War II
* {{USS|Pike|SS-173}} was a U.S. Navy [[United States Porpoise-class submarine|''Porpoise''-class submarine]] during World War II
* {{USS|Sproston|DD-173}} was a U.S. Navy {{sclass|Wickes|destroyer}} following World War II
* [[Vought V-173]] (Flying Pancake) was a U.S. Navy experimental test aircraft during World War II

==In transportation==
* The [[Georgia Railroad]], the world longest railroad in 1845, ran for {{convert|173|mi|km}} from [[Augusta, Georgia|Augusta]] to [[Marthasville, Georgia|Marthasville]] ([[Atlanta, Georgia]])
* [[United Airlines Flight 173]] en route from [[Stapleton International Airport|Denver]] to [[Portland International Airport|Portland]] crashed on December 28, 1978
* The Velocity 173 was a kit aircraft produced by [[Velocity Aircraft]] in the early 1990s.

==In popular culture==
* The book ''[[173 Hours in Captivity]]'' (2000)
* [[SCP-173]], a fictional statue

==In other fields==
'''173''' is also:
* The year [[173|AD 173]] or [[173 BC]]
* 173 AH is a year in the [[Islamic calendar]] that corresponds to [[789]] &ndash; [[790]] [[Common Era|CE]]
* The [[atomic number]] of an element temporarily called [[unsepttrium]]
* Topic of discussion during the podcast "[[Skeptics with a K]]" episode 180 <ref>{{cite podcast |url=http://www.merseysideskeptics.org.uk/2016/08/skeptics-with-a-k-episode-180/ |title=Skeptics with a K: Episode #180 |website=www.merseysideskeptics.org.uk/podcasts/ |publisher=[[Merseyside Skeptics Society]] |host=Michael Marshall |date=August 25, 2016 |time=0:59:15-1:01:30 |access-date=15 November 2016 }}</ref>

==See also==
* [[List of highways numbered 173]]
* [[United Nations Security Council Resolution 173]]
* [[List of United States Supreme Court cases, volume 173|United States Supreme Court cases, Volume 173]]

==External links==
{{Commons category}}
* [https://web.archive.org/web/20061002152411/http://athensohio.net/reference/number/173/ Number Facts and Trivia: 173]
* [https://t5k.org/curios/page.php/173.html Prime curiosities: 173]
* [http://www.numbergossip.com/173 Number Gossip: 173]

== References ==
{{Reflist}}
{{Integers|1}}

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[[Category:Integers]]