31327657 has 2 divisors, whose sum is σ = 31327658. Its totient is φ = 31327656.

The previous prime is 31327613. The next prime is 31327663. The reversal of 31327657 is 75672313.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19105641 + 12222016 = 4371^2 + 3496^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31327657 is a prime.

It is not a weakly prime, because it can be changed into another prime (31327057) 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, 15663828 + 15663829.

It is an arithmetic number, because the mean of its divisors is an integer number (15663829).

Almost surely, 2^31327657 is an apocalyptic number.

It is an amenable number.

31327657 is a deficient number, since it is larger than the sum of its proper divisors (1).

31327657 is an equidigital number, since it uses as much as digits as its factorization.

31327657 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 26460, while the sum is 34.

The square root of 31327657 is about 5597.1114871869. Note that the first 3 decimals coincide. The cubic root of 31327657 is about 315.2409578187.

The spelling of 31327657 in words is "thirty-one million, three hundred twenty-seven thousand, six hundred fifty-seven".