31979261 has 16 divisors (see below), whose sum is σ = 35904960. Its totient is φ = 28304640.

The previous prime is 31979249. The next prime is 31979267. The reversal of 31979261 is 16297913.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 31979261 - 2¹⁴ = 31962877 is a prime.

It is a super-2 number, since 2×31979261² = 2045346268212242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31979267) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 58190 + ... + 58736.

It is an arithmetic number, because the mean of its divisors is an integer number (2244060).

Almost surely, 2^31979261 is an apocalyptic number.

It is an amenable number.

31979261 is a deficient number, since it is larger than the sum of its proper divisors (3925699).

31979261 is a wasteful number, since it uses less digits than its factorization.

31979261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 764.

The product of its digits is 20412, while the sum is 38.

The square root of 31979261 is about 5655.0208664513. The cubic root of 31979261 is about 317.4116099250.

The spelling of 31979261 in words is "thirty-one million, nine hundred seventy-nine thousand, two hundred sixty-one".