133531320 has 64 divisors (see below), whose sum is σ = 431413920. Its totient is φ = 32868864.

The previous prime is 133531319. The next prime is 133531339. The reversal of 133531320 is 23135331.

It is a super-2 number, since 2×133531320² = 35661226841884800, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 41239 + ... + 44358.

Almost surely, 2^133531320 is an apocalyptic number.

133531320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

133531320 is an abundant number, since it is smaller than the sum of its proper divisors (297882600).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

133531320 is a wasteful number, since it uses less digits than its factorization.

133531320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85624 (or 85620 counting only the distinct ones).

The product of its (nonzero) digits is 810, while the sum is 21.

The square root of 133531320 is about 11555.5752777609. The cubic root of 133531320 is about 511.1256949560.

Adding to 133531320 its reverse (23135331), we get a palindrome (156666651).

The spelling of 133531320 in words is "one hundred thirty-three million, five hundred thirty-one thousand, three hundred twenty".