31518655973 has 12 divisors (see below), whose sum is σ = 36679144320. Its totient is φ = 27005243832.

The previous prime is 31518655933. The next prime is 31518655997. The reversal of 31518655973 is 37955681513.

It is not a de Polignac number, because 31518655973 - 2²⁰ = 31517607397 is a prime.

It is a Smith number, since the sum of its digits (53) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31518655933) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2261 + ... + 251082.

It is an arithmetic number, because the mean of its divisors is an integer number (3056595360).

Almost surely, 2^31518655973 is an apocalyptic number.

It is an amenable number.

31518655973 is a deficient number, since it is larger than the sum of its proper divisors (5160488347).

31518655973 is a wasteful number, since it uses less digits than its factorization.

31518655973 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 255896 (or 255889 counting only the distinct ones).

The product of its digits is 3402000, while the sum is 53.

The spelling of 31518655973 in words is "thirty-one billion, five hundred eighteen million, six hundred fifty-five thousand, nine hundred seventy-three".