31431312232 has 16 divisors (see below), whose sum is σ = 58942219140. Its totient is φ = 15713387136.

The previous prime is 31431312203. The next prime is 31431312271. The reversal of 31431312232 is 23221313413.

It can be written as a sum of positive squares in 2 ways, for example, as 22986804996 + 8444507236 = 151614^2 + 91894^2 .

It is a junction number, because it is equal to n+sod(n) for n = 31431312197 and 31431312206.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 224013 + ... + 336220.

Almost surely, 2^31431312232 is an apocalyptic number.

It is an amenable number.

31431312232 is a deficient number, since it is larger than the sum of its proper divisors (27510906908).

31431312232 is a wasteful number, since it uses less digits than its factorization.

31431312232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 567252 (or 567248 counting only the distinct ones).

The product of its digits is 2592, while the sum is 25.

Adding to 31431312232 its reverse (23221313413), we get a palindrome (54652625645).

The spelling of 31431312232 in words is "thirty-one billion, four hundred thirty-one million, three hundred twelve thousand, two hundred thirty-two".