129 (one hundred [and] twenty-nine) is the natural number following 128 and preceding 130. In mathematics 129 is the sum of the first ten prime numbers. It is the smallest number that can be expressed as a sum of three squares in four different ways: , , , and . 129 is the product of only two primes, 3 and 43, making 129 a semiprime. Since 3 and 43 are both Gaussian primes, this means that 129 is a Blum integer. 129 is a repdigit in base 6 (333). 129 is a happy number. 129 is a centered octahedral number. In the military Raytheon AGM-129 ACM (Advanced Cruise Missile) was a low observable, sub-sonic, jet-powered, air-launched cruise missile used by the United States Air Force Soviet submarine K-129 (1960) was a Soviet Pacific Fleet nuclear submarine that sank in 1968 was a United States Navy Mission Buenaventura-class fleet oilers during World War II was a Crosley-class high speed transport of the United States Navy was the lead ship of her class of destroyer escort in the United States Navy was a United States Navy Haskell-class attack transport during World War II was a United States Navy Crater-class cargo ship during World War II was a United States Navy Auk-class minesweeper for removing naval mines laid in the water Agusta A129 Mangusta is an attack helicopter originally designed and produced by Italian company Agusta The 129th Rescue Wing (129 RQW) is a unit of the California Air National Guard In transportation LZ 129 Hindenburg was a German zeppelin which went up in flames while landing on May 6, 1937 London Buses route 129 is a Transport for London contracted bus route in London STS-129 was a Space Shuttle mission to the International Space Station, flown in November 2009 by the shuttle Atlantis''. In other fields 129 is also: The year AD 129 or 129 BC 129 AH is a year in the Islamic calendar that corresponds to 746–747 CE 129 Antigone is a main belt asteroid The atomic number of unbiennium, an element yet to be discovered A film format: 129 film Sonnet 129 by William Shakespeare See also List of highways numbered 129 United Nations Security Council Resolution 129 References Integers