133 (number)
133 is the natural number following 132 and preceding 134.
In mathematics
133 is an n whose divisors 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 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.
133 is the number of compositions of 13 into distinct parts.
133 is the 100th composite number.