173 (number)

← 172 173 174 →
← 170 171 172 173 174 175 176 177 178 179 → List of numbers Integers ← 0 100 200 300 400 500 600 700 800 900 →
Cardinal	one hundred seventy-three
Ordinal	173rd (one hundred seventy-third)
Factorization	prime
Prime	40th
Divisors	1, 173
Greek numeral	ΡΟΓ´
Roman numeral	CLXXIII
Binary	101011012
Ternary	201023
Senary	4456
Octal	2558
Duodecimal	12512
Hexadecimal	AD16

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

In mathematics

173 is:

• an odd number.
• a deficient number.
• an odious number.
• a balanced prime. ^[1]
• an Eisenstein prime with no imaginary part.
• a Sophie Germain prime. ^[2]
• a Pythagorean prime
• a Higgs prime
• an Isolated Prime
• a Regular Prime
• a Sexy Prime
• a Truncatable Prime
• an inconsummate number. ^[3]
• the sum of 2 squares: 2² + 13².
• the sum of three consecutive prime numbers: 53 + 59 + 61.
• Palindromic number in bases 3 (20102₃) and 9 (212₉).
• the 40th prime number following 167 and preceding 179.

In astronomy

• 173 Ino is a large dark main belt asteroid
• 173P/Mueller is a periodic comet in the Solar System
• Arp 173 (VV 296, KPG 439) is a pair of 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 of the United States Army based in Vicenza
• 173rd Battalion unit of the Canadian Expeditionary Force during the World War I
• 173rd Special Operations Aviation Squadron of the Australian Army
• K-173 Chelyabinsk Russian Oscar-class submarine
• USNS Provo (T-AG-173) was a U.S. Navy Phoenix-class auxiliary ship following World War II
• USS Codington (AK-173) was a U.S. Navy Alamosa-class cargo ship during World War II
• USS Eldridge (DE-173) was a U.S. Navy Cannon-class destroyer escort during World War II
• USS Etamin (IX-173) was a U.S. Navy Crater-class cargo ship 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 Haskell-class attack transport ship during World War II
• USS PC-472 was a 173-foot (53 m) U.S. Navy submarine chaser during World War II
• USS Pike (SS-173) was a U.S. Navy Porpoise-class submarine during World War II
• USS Sproston (DD-173) was a U.S. Navy Wickes-class 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 173 miles (278 km) from Augusta to Marthasville (Atlanta, Georgia)
• United Airlines Flight 173 en route from Denver to 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 AD 173 or 173 BC
• 173 AH is a year in the Islamic calendar that corresponds to 789 – 790 CE
• The atomic number of an element temporarily called unsepttrium
• Topic of discussion during the podcast "Skeptics with a K" episode 180 ^[4]

See also

• List of highways numbered 173
• United Nations Security Council Resolution 173
• United States Supreme Court cases, Volume 173

External links

• Number Facts and Trivia: 173
• Prime curiosities: 173
• Number Gossip: 173

References

1. "Sloane's A006562 : Balanced primes". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-26.
2. "Sloane's A005384 : Sophie Germain primes". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-26.
3. "Sloane's A003635 : Inconsummate numbers in base 10". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-26.
4. Michael Marshall (August 25, 2016). "Skeptics with a K: Episode #180". www.merseysideskeptics.org.uk/podcasts/ (Podcast). Merseyside Skeptics Society. Event occurs at 0:59:15-1:01:30. Retrieved 15 November 2016.