31621926457 has 32 divisors (see below), whose sum is σ = 38128523904. Its totient is φ = 25893043200.

The previous prime is 31621926407. The next prime is 31621926467. The reversal of 31621926457 is 75462912613.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 31621926457 - 2²⁷ = 31487708729 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31621926407) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 384598 + ... + 459520.

It is an arithmetic number, because the mean of its divisors is an integer number (1191516372).

Almost surely, 2^31621926457 is an apocalyptic number.

31621926457 is a gapful number since it is divisible by the number (37) formed by its first and last digit.

It is an amenable number.

31621926457 is a deficient number, since it is larger than the sum of its proper divisors (6506597447).

31621926457 is a wasteful number, since it uses less digits than its factorization.

31621926457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75049.

The product of its digits is 544320, while the sum is 46.

The spelling of 31621926457 in words is "thirty-one billion, six hundred twenty-one million, nine hundred twenty-six thousand, four hundred fifty-seven".