133 (one hundred [and] thirty-three) is the natural number following 132 and preceding 134.
133 is an n whose divisors (excluding n itself) added up divide ÃÂ(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.
133 is the 100th composite number.