31712681 has 24 divisors (see below), whose sum is σ = 42830784. Its totient is φ = 22800960.

The previous prime is 31712657. The next prime is 31712683. The reversal of 31712681 is 18621713.

It is not a de Polignac number, because 31712681 - 2⁶ = 31712617 is a prime.

It is a super-2 number, since 2×31712681² = 2011388272415522, which contains 22 as substring.

It is a hoax number, since the sum of its digits (29) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31712683) 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, 11795 + ... + 14231.

It is an arithmetic number, because the mean of its divisors is an integer number (1784616).

Almost surely, 2^31712681 is an apocalyptic number.

It is an amenable number.

31712681 is a deficient number, since it is larger than the sum of its proper divisors (11118103).

31712681 is a wasteful number, since it uses less digits than its factorization.

31712681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2481 (or 2468 counting only the distinct ones).

The product of its digits is 2016, while the sum is 29.

The square root of 31712681 is about 5631.4013353694. The cubic root of 31712681 is about 316.5271637916.

The spelling of 31712681 in words is "thirty-one million, seven hundred twelve thousand, six hundred eighty-one".