31513972 has 12 divisors (see below), whose sum is σ = 63028000. Its totient is φ = 13505976.

The previous prime is 31513967. The next prime is 31513987. The reversal of 31513972 is 27931513.

31513972 is an admirable number.

It is a congruent number.

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, 562722 + ... + 562777.

Almost surely, 2^31513972 is an apocalyptic number.

It is an amenable number.

31513972 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

31513972 is a wasteful number, since it uses less digits than its factorization.

31513972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1125510 (or 1125508 counting only the distinct ones).

The product of its digits is 5670, while the sum is 31.

The square root of 31513972 is about 5613.7306668560. The cubic root of 31513972 is about 315.8646672539.

The spelling of 31513972 in words is "thirty-one million, five hundred thirteen thousand, nine hundred seventy-two".