31331611672 has 8 divisors (see below), whose sum is σ = 58746771900. Its totient is φ = 15665805832.

The previous prime is 31331611657. The next prime is 31331611673. The reversal of 31331611672 is 27611613313.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31331611673) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1958225722 + ... + 1958225737.

Almost surely, 2^31331611672 is an apocalyptic number.

It is an amenable number.

31331611672 is a deficient number, since it is larger than the sum of its proper divisors (27415160228).

31331611672 is a wasteful number, since it uses less digits than its factorization.

31331611672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3916451465 (or 3916451461 counting only the distinct ones).

The product of its digits is 13608, while the sum is 34.

The spelling of 31331611672 in words is "thirty-one billion, three hundred thirty-one million, six hundred eleven thousand, six hundred seventy-two".