331231131 has 36 divisors (see below), whose sum is σ = 607163544. Its totient is φ = 172065600.

The previous prime is 331231129. The next prime is 331231139. The reversal of 331231131 is 131132133.

It is a happy number.

It is not a de Polignac number, because 331231131 - 2¹ = 331231129 is a prime.

It is a super-2 number, since 2×331231131² = 219428124287078322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (331231139) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 29290 + ... + 38991.

It is an arithmetic number, because the mean of its divisors is an integer number (16865654).

Almost surely, 2^331231131 is an apocalyptic number.

331231131 is a deficient number, since it is larger than the sum of its proper divisors (275932413).

331231131 is a wasteful number, since it uses less digits than its factorization.

331231131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68312 (or 68302 counting only the distinct ones).

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

The square root of 331231131 is about 18199.7563445229. The cubic root of 331231131 is about 691.9006137407.

Adding to 331231131 its reverse (131132133), we get a palindrome (462363264).

It can be divided in two parts, 3312 and 31131, that added together give a palindrome (34443).

The spelling of 331231131 in words is "three hundred thirty-one million, two hundred thirty-one thousand, one hundred thirty-one".