31997546 has 16 divisors (see below), whose sum is σ = 55036800. Its totient is φ = 13667280.

The previous prime is 31997533. The next prime is 31997551. The reversal of 31997546 is 64579913.

It is a junction number, because it is equal to n+sod(n) for n = 31997497 and 31997506.

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, 680 + ... + 8028.

It is an arithmetic number, because the mean of its divisors is an integer number (3439800).

Almost surely, 2^31997546 is an apocalyptic number.

31997546 is a deficient number, since it is larger than the sum of its proper divisors (23039254).

31997546 is a wasteful number, since it uses less digits than its factorization.

31997546 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7669.

The product of its digits is 204120, while the sum is 44.

The square root of 31997546 is about 5656.6373403286. The cubic root of 31997546 is about 317.4720945983.

The spelling of 31997546 in words is "thirty-one million, nine hundred ninety-seven thousand, five hundred forty-six".