31997091225 has 48 divisors (see below), whose sum is σ = 58939084800. Its totient is φ = 15183643200.

The previous prime is 31997091211. The next prime is 31997091257. The reversal of 31997091225 is 52219079913.

It is not a de Polignac number, because 31997091225 - 2⁸ = 31997090969 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 373825 + ... + 451374.

It is an arithmetic number, because the mean of its divisors is an integer number (1227897600).

Almost surely, 2^31997091225 is an apocalyptic number.

It is an amenable number.

31997091225 is a deficient number, since it is larger than the sum of its proper divisors (26941993575).

31997091225 is a wasteful number, since it uses less digits than its factorization.

31997091225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 825270 (or 825265 counting only the distinct ones).

The product of its (nonzero) digits is 306180, while the sum is 48.

The spelling of 31997091225 in words is "thirty-one billion, nine hundred ninety-seven million, ninety-one thousand, two hundred twenty-five".