31974813 has 12 divisors (see below), whose sum is σ = 49738780. Its totient is φ = 19676736.

The previous prime is 31974809. The next prime is 31974821. The reversal of 31974813 is 31847913.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 9903609 + 22071204 = 3147^2 + 4698^2 .

It is not a de Polignac number, because 31974813 - 2² = 31974809 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31974913) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 136528 + ... + 136761.

Almost surely, 2^31974813 is an apocalyptic number.

It is an amenable number.

31974813 is a deficient number, since it is larger than the sum of its proper divisors (17763967).

31974813 is a wasteful number, since it uses less digits than its factorization.

31974813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 273308 (or 273305 counting only the distinct ones).

The product of its digits is 18144, while the sum is 36.

The square root of 31974813 is about 5654.6275739433. The cubic root of 31974813 is about 317.3968929672.

The spelling of 31974813 in words is "thirty-one million, nine hundred seventy-four thousand, eight hundred thirteen".