31938125631 has 4 divisors (see below), whose sum is σ = 42584167512. Its totient is φ = 21292083752.

The previous prime is 31938125591. The next prime is 31938125651. The reversal of 31938125631 is 13652183913.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 31938125631 - 2¹⁰ = 31938124607 is a prime.

It is a super-2 number, since 2×31938125631² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31938125651) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5323020936 + ... + 5323020941.

It is an arithmetic number, because the mean of its divisors is an integer number (10646041878).

Almost surely, 2^31938125631 is an apocalyptic number.

31938125631 is a deficient number, since it is larger than the sum of its proper divisors (10646041881).

31938125631 is a wasteful number, since it uses less digits than its factorization.

31938125631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10646041880.

The product of its digits is 116640, while the sum is 42.

The spelling of 31938125631 in words is "thirty-one billion, nine hundred thirty-eight million, one hundred twenty-five thousand, six hundred thirty-one".