31694939 has 2 divisors, whose sum is σ = 31694940. Its totient is φ = 31694938.

The previous prime is 31694933. The next prime is 31694959. The reversal of 31694939 is 93949613.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 31694939 - 2⁸ = 31694683 is a 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 31694939.

It is not a weakly prime, because it can be changed into another prime (31694933) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15847469 + 15847470.

It is an arithmetic number, because the mean of its divisors is an integer number (15847470).

Almost surely, 2^31694939 is an apocalyptic number.

31694939 is a deficient number, since it is larger than the sum of its proper divisors (1).

31694939 is an equidigital number, since it uses as much as digits as its factorization.

31694939 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 157464, while the sum is 44.

The square root of 31694939 is about 5629.8258410008. The cubic root of 31694939 is about 316.4681246064.

The spelling of 31694939 in words is "thirty-one million, six hundred ninety-four thousand, nine hundred thirty-nine".