31391053988 has 48 divisors (see below), whose sum is σ = 63170150400. Its totient is φ = 13370293920.

The previous prime is 31391053957. The next prime is 31391054011. The reversal of 31391053988 is 88935019313.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7693733 + ... + 7697811.

It is an arithmetic number, because the mean of its divisors is an integer number (1316044800).

Almost surely, 2^31391053988 is an apocalyptic number.

It is an amenable number.

31391053988 is an abundant number, since it is smaller than the sum of its proper divisors (31779096412).

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

31391053988 is a wasteful number, since it uses less digits than its factorization.

31391053988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5720 (or 5718 counting only the distinct ones).

The product of its (nonzero) digits is 699840, while the sum is 50.

The spelling of 31391053988 in words is "thirty-one billion, three hundred ninety-one million, fifty-three thousand, nine hundred eighty-eight".