133 (number)


133 is the natural number following 132 and preceding 134.

In mathematics

133 is an n whose divisors added up divide φ. It is an octagonal number and a Harshad number. It is also a happy number.
133 is a repdigit in base 11 and base 18, 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 the military

133 is also: