31868631 has 12 divisors (see below), whose sum is σ = 46489560. Its totient is φ = 21034800.

The previous prime is 31868561. The next prime is 31868647. The reversal of 31868631 is 13686813.

31868631 is a `hidden beast` number, since 3 + 18 + 6 + 8 + 631 = 666.

It is a de Polignac number, because none of the positive numbers 2^k-31868631 is a prime.

It is a super-2 number, since 2×31868631² = 2031219283628322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31868231) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16621 + ... + 18438.

It is an arithmetic number, because the mean of its divisors is an integer number (3874130).

Almost surely, 2^31868631 is an apocalyptic number.

31868631 is a deficient number, since it is larger than the sum of its proper divisors (14620929).

31868631 is a wasteful number, since it uses less digits than its factorization.

31868631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35166 (or 35163 counting only the distinct ones).

The product of its digits is 20736, while the sum is 36.

The square root of 31868631 is about 5645.2308190188. The cubic root of 31868631 is about 317.0451660046.

The spelling of 31868631 in words is "thirty-one million, eight hundred sixty-eight thousand, six hundred thirty-one".