31390657922 has 54 divisors (see below), whose sum is σ = 53427303657. Its totient is φ = 13825008912.

The previous prime is 31390657897. The next prime is 31390657931. The reversal of 31390657922 is 22975609313.

It can be written as a sum of positive squares in 2 ways, for example, as 26839941241 + 4550716681 = 163829^2 + 67459^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=125281.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 74917829 + ... + 74918247.

Almost surely, 2^31390657922 is an apocalyptic number.

31390657922 is a deficient number, since it is larger than the sum of its proper divisors (22036645735).

31390657922 is an equidigital number, since it uses as much as digits as its factorization.

31390657922 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 912 (or 457 counting only the distinct ones).

The product of its (nonzero) digits is 612360, while the sum is 47.

The spelling of 31390657922 in words is "thirty-one billion, three hundred ninety million, six hundred fifty-seven thousand, nine hundred twenty-two".