31131312332 has 24 divisors (see below), whose sum is σ = 54664596000. Its totient is φ = 15512904576.

The previous prime is 31131312319. The next prime is 31131312347. The reversal of 31131312332 is 23321313113.

It is a junction number, because it is equal to n+sod(n) for n = 31131312298 and 31131312307.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3335969 + ... + 3345287.

It is an arithmetic number, because the mean of its divisors is an integer number (2277691500).

Almost surely, 2^31131312332 is an apocalyptic number.

It is an amenable number.

31131312332 is a deficient number, since it is larger than the sum of its proper divisors (23533283668).

31131312332 is a wasteful number, since it uses less digits than its factorization.

31131312332 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12065 (or 12063 counting only the distinct ones).

The product of its digits is 972, while the sum is 23.

Adding to 31131312332 its reverse (23321313113), we get a palindrome (54452625445).

The spelling of 31131312332 in words is "thirty-one billion, one hundred thirty-one million, three hundred twelve thousand, three hundred thirty-two".