331213131 has 28 divisors (see below), whose sum is σ = 498932640. Its totient is φ = 219769200.

The previous prime is 331213117. The next prime is 331213139. The reversal of 331213131 is 131312133.

It is a happy number.

331213131 is a `hidden beast` number, since 331 + 21 + 313 + 1 = 666.

It is not a de Polignac number, because 331213131 - 2⁶ = 331213067 is a prime.

It is a super-2 number, since 2×331213131² = 219404276293646322, which contains 22 as substring.

It is a nialpdrome in base 9.

It is not an unprimeable number, because it can be changed into a prime (331213139) by changing a digit.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 173281 + ... + 175181.

Almost surely, 2^331213131 is an apocalyptic number.

331213131 is a deficient number, since it is larger than the sum of its proper divisors (167719509).

331213131 is an equidigital number, since it uses as much as digits as its factorization.

331213131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2158 (or 2143 counting only the distinct ones).

The product of its digits is 162, while the sum is 18.

The square root of 331213131 is about 18199.2618256895. The cubic root of 331213131 is about 691.8880802603. Note that the first 3 decimals are identical.

Adding to 331213131 its reverse (131312133), we get a palindrome (462525264).

The spelling of 331213131 in words is "three hundred thirty-one million, two hundred thirteen thousand, one hundred thirty-one".