31081881472 has 32 divisors (see below), whose sum is σ = 61938653400. Its totient is φ = 15536494080.

The previous prime is 31081881433. The next prime is 31081881491. The reversal of 31081881472 is 27418818013.

It is a tau number, because it is divible by the number of its divisors (32).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 439554 + ... + 505342.

Almost surely, 2^31081881472 is an apocalyptic number.

31081881472 is a gapful number since it is divisible by the number (32) formed by its first and last digit.

It is an amenable number.

31081881472 is a deficient number, since it is larger than the sum of its proper divisors (30856771928).

31081881472 is an equidigital number, since it uses as much as digits as its factorization.

31081881472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69494 (or 69482 counting only the distinct ones).

The product of its (nonzero) digits is 86016, while the sum is 43.

The spelling of 31081881472 in words is "thirty-one billion, eighty-one million, eight hundred eighty-one thousand, four hundred seventy-two".