31939655693913 has 48 divisors (see below), whose sum is σ = 51214620038400. Its totient is φ = 19017219155040.

The previous prime is 31939655693899. The next prime is 31939655694061.

31939655693913 is a `hidden beast` number, since 3 + 1 + 9 + 39 + 6 + 556 + 9 + 39 + 1 + 3 = 666.

31939655693913 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 31939655693913 - 2¹⁸ = 31939655431769 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31939655692913) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 7491406 + ... + 10954472.

It is an arithmetic number, because the mean of its divisors is an integer number (1066971250800).

Almost surely, 2^{31939655693913} is an apocalyptic number.

31939655693913 is a gapful number since it is divisible by the number (33) formed by its first and last digit.

It is an amenable number.

31939655693913 is a deficient number, since it is larger than the sum of its proper divisors (19274964344487).

31939655693913 is a wasteful number, since it uses less digits than its factorization.

31939655693913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3464722 (or 3464719 counting only the distinct ones).

The product of its digits is 478296900, while the sum is 72.

The spelling of 31939655693913 in words is "thirty-one trillion, nine hundred thirty-nine billion, six hundred fifty-five million, six hundred ninety-three thousand, nine hundred thirteen".