133031331 has 24 divisors (see below), whose sum is σ = 205059920. Its totient is φ = 82861056.

The previous prime is 133031299. The next prime is 133031377. The reversal of 133031331 is 133130331.

133031331 is a `hidden beast` number, since 1 + 330 + 3 + 1 + 331 = 666.

It is not a de Polignac number, because 133031331 - 2⁵ = 133031299 is a prime.

It is a super-2 number, since 2×133031331² = 35394670055263122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (133031531) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7155 + ... + 17811.

Almost surely, 2^133031331 is an apocalyptic number.

133031331 is a deficient number, since it is larger than the sum of its proper divisors (72028589).

133031331 is a wasteful number, since it uses less digits than its factorization.

133031331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10755 (or 10752 counting only the distinct ones).

The product of its (nonzero) digits is 243, while the sum is 18.

The square root of 133031331 is about 11533.9208858046. The cubic root of 133031331 is about 510.4869512861.

Adding to 133031331 its reverse (133130331), we get a palindrome (266161662).

The spelling of 133031331 in words is "one hundred thirty-three million, thirty-one thousand, three hundred thirty-one".