31590137 has 2 divisors, whose sum is σ = 31590138. Its totient is φ = 31590136.

The previous prime is 31590133. The next prime is 31590149. The reversal of 31590137 is 73109513.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30647296 + 942841 = 5536^2 + 971^2 .

It is a cyclic number.

It is not a de Polignac number, because 31590137 - 2² = 31590133 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (31590133) 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, 15795068 + 15795069.

It is an arithmetic number, because the mean of its divisors is an integer number (15795069).

Almost surely, 2^31590137 is an apocalyptic number.

It is an amenable number.

31590137 is a deficient number, since it is larger than the sum of its proper divisors (1).

31590137 is an equidigital number, since it uses as much as digits as its factorization.

31590137 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2835, while the sum is 29.

The square root of 31590137 is about 5620.5103860771. The cubic root of 31590137 is about 316.1189298907.

The spelling of 31590137 in words is "thirty-one million, five hundred ninety thousand, one hundred thirty-seven".