31371643641 has 32 divisors (see below), whose sum is σ = 47682432000. Its totient is φ = 18187288128.

The previous prime is 31371643637. The next prime is 31371643649. The reversal of 31371643641 is 14634617313.

It is not a de Polignac number, because 31371643641 - 2² = 31371643637 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a self number, because there is not a number n which added to its sum of digits gives 31371643641.

It is not an unprimeable number, because it can be changed into a prime (31371643649) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 14380 + ... + 250898.

It is an arithmetic number, because the mean of its divisors is an integer number (1490076000).

Almost surely, 2^31371643641 is an apocalyptic number.

It is an amenable number.

31371643641 is a deficient number, since it is larger than the sum of its proper divisors (16310788359).

31371643641 is a wasteful number, since it uses less digits than its factorization.

31371643641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 236733.

The product of its digits is 108864, while the sum is 39.

The spelling of 31371643641 in words is "thirty-one billion, three hundred seventy-one million, six hundred forty-three thousand, six hundred forty-one".