31621317923 has 16 divisors (see below), whose sum is σ = 34950414240. Its totient is φ = 28430113536.

The previous prime is 31621317911. The next prime is 31621317979. The reversal of 31621317923 is 32971312613.

It is a cyclic number.

It is not a de Polignac number, because 31621317923 - 2²⁰ = 31620269347 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31621317223) 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 15 ways as a sum of consecutive naturals, for example, 126440 + ... + 281477.

It is an arithmetic number, because the mean of its divisors is an integer number (2184400890).

Almost surely, 2^31621317923 is an apocalyptic number.

31621317923 is a deficient number, since it is larger than the sum of its proper divisors (3329096317).

31621317923 is a wasteful number, since it uses less digits than its factorization.

31621317923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 408086.

The product of its digits is 40824, while the sum is 38.

The spelling of 31621317923 in words is "thirty-one billion, six hundred twenty-one million, three hundred seventeen thousand, nine hundred twenty-three".