133031520 has 72 divisors (see below), whose sum is σ = 453974976. Its totient is φ = 35474688.

The previous prime is 133031519. The next prime is 133031527. The reversal of 133031520 is 25130331.

133031520 is a `hidden beast` number, since 1 + 330 + 315 + 20 = 666.

It is a tau number, because it is divible by the number of its divisors (72).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 133031493 and 133031502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133031527) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 44752 + ... + 47631.

It is an arithmetic number, because the mean of its divisors is an integer number (6305208).

Almost surely, 2^133031520 is an apocalyptic number.

133031520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

133031520 is an abundant number, since it is smaller than the sum of its proper divisors (320943456).

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

133031520 is a wasteful number, since it uses less digits than its factorization.

133031520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92404 (or 92393 counting only the distinct ones).

The product of its (nonzero) digits is 270, while the sum is 18.

The square root of 133031520 is about 11533.9290790259. The cubic root of 133031520 is about 510.4871930387.

Adding to 133031520 its reverse (25130331), we get a palindrome (158161851).

The spelling of 133031520 in words is "one hundred thirty-three million, thirty-one thousand, five hundred twenty".