133 (number)

133 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 Harshad number. It is also a happy number.

133 is a repdigit in base 11 (111), 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.

In other fields

• 133 is the emergency telephone number in Chile
• The year 133 or 133 BC
• 133 (One-Thirty-Three) is the nickname of Slipknot sampler/keyboardist Craig Jones and Dean Morgan.
• 133 is a the name of a David Guetta song, from the album Just a Little More Love (perhaps because it is a happy number)
• The C-133 Cargomaster is a very large American cargo aircraft, of which 50 were built. It could carry 110,000 lb (50,000 kg) for 3,560 nautical miles. It has been mostly out of service since 1971, being replaced by the Lockheed C-5 Galaxy.
• 133 MHz was a common 32-bit processor CPU speed circa 1995, such as the Intel Pentium and AMD AMD K5.