133 (number)

133 (one hundred [and] thirty-three) is a natural number. It is after 132 and before 134.
In mathematics.
The sum of 133's proper divisors is equal to φ("n").
133 is an octagonal number, a Harshad number and a happy number.
In base 11(111) and base 18(77), 133 is a repdigit(a natural number that has only one type of digit).
133 is a semiprime number number(a product of 7 and 19). 7 and 19 are both Gaussian primes. This makes that 133 is a Blum integer
In other fields.
133 is also: