31680621 has 24 divisors (see below), whose sum is σ = 53715584. Its totient is φ = 17612640.

The previous prime is 31680587. The next prime is 31680629. The reversal of 31680621 is 12608613.

31680621 is a `hidden beast` number, since 31 + 6 + 8 + 0 + 621 = 666.

It is not a de Polignac number, because 31680621 - 2²³ = 23292013 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31680629) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4465 + ... + 9126.

Almost surely, 2^31680621 is an apocalyptic number.

It is an amenable number.

31680621 is a deficient number, since it is larger than the sum of its proper divisors (22034963).

31680621 is a wasteful number, since it uses less digits than its factorization.

31680621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13641 (or 13638 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 31680621 is about 5628.5540772031. The cubic root of 31680621 is about 316.4204632317.

The spelling of 31680621 in words is "thirty-one million, six hundred eighty thousand, six hundred twenty-one".