133 (one hundred [and] thirty-three) is the natural number following 132 and preceding 134. In mathematics 133 is an n whose divisors (excluding n itself) added up divide φ(n). It is an octagonal number and a happy number. 133 is a Harshad number, because it is divisible by the sum of its digits. 133 is a repdigit in base 11 (111) and base 18 (77), whilst in base 20 it is a cyclic number formed from the reciprocal of the number three. 133 is a semiprime: a product of two prime numbers, namely 7 and 19. Since those prime factors are Gaussian primes, this means that 133 is a Blum integer. 133 is the number of compositions of 13 into distinct parts. In the military Douglas C-133 Cargomaster was a United States cargo aircraft built between 1956 and 1961 is a heavy landing craft which launched in 1972 was a United States Navy Mission Buenaventura-class fleet oilers during World War II was a United States Navy during World War II was a United States Navy during World War II was a United States Navy General G. O. Squier-class transport ship during World War II was a United States Navy during World War I was a United States Navy during World War II was a United States Navy during World War II was a United States Navy S-class submarine during World War II was a United States Navy during World War II was a United States Navy heavy cruiser during the Korean War Frontstalag 133 was a temporary German prisoner of war camp during World War II located near Rennes, northern France Caproni Ca.133 was a three-engine transport/bomber aircraft used by the Italian Regia Aeronautica from the Second Italo-Abyssinian War until World War II Naval Mobile Construction Battalion 133 is an active duty Seabee battalion originally commissioned during World War II as the 133rd Naval Construction Battalion(NCB) In transportation London Buses route 133 is a Transport for London contracted bus route in London RATB route 133 is bus route run by RATB in Bucharest, Romania The Fiat 133, also called SEAT 133, was a small rear-engine car developed in Spain between 1974 and 1979 STS-133 is a Space Shuttle Endeavour contingency mission which was Discoverys 39th and final mission. The mission launched on 24 February 2011, and landed on 9 March 2011. The Bücker Bü 133 Jungmeister was a single-engine, single-seat