31881631941 has 8 divisors (see below), whose sum is σ = 47232047360. Its totient is φ = 21254421276.

The previous prime is 31881631927. The next prime is 31881631961. The reversal of 31881631941 is 14913618813.

31881631941 is a `hidden beast` number, since 3 + 1 + 8 + 8 + 1 + 631 + 9 + 4 + 1 = 666.

It is not a de Polignac number, because 31881631941 - 2¹¹ = 31881629893 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31881631961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 590400565 + ... + 590400618.

It is an arithmetic number, because the mean of its divisors is an integer number (5904005920).

Almost surely, 2^31881631941 is an apocalyptic number.

It is an amenable number.

31881631941 is a deficient number, since it is larger than the sum of its proper divisors (15350415419).

31881631941 is a wasteful number, since it uses less digits than its factorization.

31881631941 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1180801192 (or 1180801186 counting only the distinct ones).

The product of its digits is 124416, while the sum is 45.

The spelling of 31881631941 in words is "thirty-one billion, eight hundred eighty-one million, six hundred thirty-one thousand, nine hundred forty-one".