31983813 has 12 divisors (see below), whose sum is σ = 47326188. Its totient is φ = 20802240.

The previous prime is 31983803. The next prime is 31983827. The reversal of 31983813 is 31838913.

It can be written as a sum of positive squares in 2 ways, for example, as 9345249 + 22638564 = 3057^2 + 4758^2 .

It is not a de Polignac number, because 31983813 - 2⁴ = 31983797 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31983803) 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, 42970 + ... + 43707.

It is an arithmetic number, because the mean of its divisors is an integer number (3943849).

Almost surely, 2^31983813 is an apocalyptic number.

It is an amenable number.

31983813 is a deficient number, since it is larger than the sum of its proper divisors (15342375).

31983813 is a wasteful number, since it uses less digits than its factorization.

31983813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86724 (or 86721 counting only the distinct ones).

The product of its digits is 15552, while the sum is 36.

The square root of 31983813 is about 5655.4233263302. The cubic root of 31983813 is about 317.4266695715.

The spelling of 31983813 in words is "thirty-one million, nine hundred eighty-three thousand, eight hundred thirteen".