31680975 has 24 divisors (see below), whose sum is σ = 53052160. Its totient is φ = 16679520.

The previous prime is 31680931. The next prime is 31681007. The reversal of 31680975 is 57908613.

It is not a de Polignac number, because 31680975 - 2¹⁶ = 31615439 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3252 + ... + 8598.

Almost surely, 2^31680975 is an apocalyptic number.

31680975 is a deficient number, since it is larger than the sum of its proper divisors (21371185).

31680975 is a wasteful number, since it uses less digits than its factorization.

31680975 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5439 (or 5434 counting only the distinct ones).

The product of its (nonzero) digits is 45360, while the sum is 39.

The square root of 31680975 is about 5628.5855239127. The cubic root of 31680975 is about 316.4216417905.

The spelling of 31680975 in words is "thirty-one million, six hundred eighty thousand, nine hundred seventy-five".