31600993 has 2 divisors, whose sum is σ = 31600994. Its totient is φ = 31600992.

The previous prime is 31600969. The next prime is 31601023. The reversal of 31600993 is 39900613.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16916769 + 14684224 = 4113^2 + 3832^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31600993 is a prime.

It is not a weakly prime, because it can be changed into another prime (31600193) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15800496 + 15800497.

It is an arithmetic number, because the mean of its divisors is an integer number (15800497).

Almost surely, 2^31600993 is an apocalyptic number.

It is an amenable number.

31600993 is a deficient number, since it is larger than the sum of its proper divisors (1).

31600993 is an equidigital number, since it uses as much as digits as its factorization.

31600993 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4374, while the sum is 31.

The square root of 31600993 is about 5621.4760517145. The cubic root of 31600993 is about 316.1551373317.

The spelling of 31600993 in words is "thirty-one million, six hundred thousand, nine hundred ninety-three".