31982939 has 2 divisors, whose sum is σ = 31982940. Its totient is φ = 31982938.

The previous prime is 31982887. The next prime is 31982957. The reversal of 31982939 is 93928913.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31982939 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31982939.

It is not a weakly prime, because it can be changed into another prime (31982039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15991469 + 15991470.

It is an arithmetic number, because the mean of its divisors is an integer number (15991470).

Almost surely, 2^31982939 is an apocalyptic number.

31982939 is a deficient number, since it is larger than the sum of its proper divisors (1).

31982939 is an equidigital number, since it uses as much as digits as its factorization.

31982939 is an evil number, because the sum of its binary digits is even.

The product of its digits is 104976, while the sum is 44.

The square root of 31982939 is about 5655.3460548405. The cubic root of 31982939 is about 317.4237781772.

The spelling of 31982939 in words is "thirty-one million, nine hundred eighty-two thousand, nine hundred thirty-nine".