31891497984 has 88 divisors (see below), whose sum is σ = 94447269920. Its totient is φ = 10630490112.

The previous prime is 31891497971. The next prime is 31891497997. The reversal of 31891497984 is 48979419813.

It is an interprime number because it is at equal distance from previous prime (31891497971) and next prime (31891497997).

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, 549094 + ... + 604389.

Almost surely, 2^31891497984 is an apocalyptic number.

It is an amenable number.

31891497984 is an abundant number, since it is smaller than the sum of its proper divisors (62555771936).

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

31891497984 is a wasteful number, since it uses less digits than its factorization.

31891497984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1153512 (or 1153488 counting only the distinct ones).

The product of its digits is 15676416, while the sum is 63.

The spelling of 31891497984 in words is "thirty-one billion, eight hundred ninety-one million, four hundred ninety-seven thousand, nine hundred eighty-four".