31131212232 has 32 divisors (see below), whose sum is σ = 78323760000. Its totient is φ = 10310973504.

The previous prime is 31131212227. The next prime is 31131212257. The reversal of 31131212232 is 23221213113.

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 31131212199 and 31131212208.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4127232 + ... + 4134767.

It is an arithmetic number, because the mean of its divisors is an integer number (2447617500).

Almost surely, 2^31131212232 is an apocalyptic number.

It is an amenable number.

31131212232 is an abundant number, since it is smaller than the sum of its proper divisors (47192547768).

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

31131212232 is a wasteful number, since it uses less digits than its factorization.

31131212232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8262165 (or 8262161 counting only the distinct ones).

The product of its digits is 432, while the sum is 21.

Adding to 31131212232 its reverse (23221213113), we get a palindrome (54352425345).

The spelling of 31131212232 in words is "thirty-one billion, one hundred thirty-one million, two hundred twelve thousand, two hundred thirty-two".