31906057 has 2 divisors, whose sum is σ = 31906058. Its totient is φ = 31906056.

The previous prime is 31906033. The next prime is 31906103. The reversal of 31906057 is 75060913.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20757136 + 11148921 = 4556^2 + 3339^2 .

It is a cyclic number.

It is not a de Polignac number, because 31906057 - 2¹¹ = 31904009 is a prime.

It is not a weakly prime, because it can be changed into another prime (31906027) 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, 15953028 + 15953029.

It is an arithmetic number, because the mean of its divisors is an integer number (15953029).

Almost surely, 2^31906057 is an apocalyptic number.

It is an amenable number.

31906057 is a deficient number, since it is larger than the sum of its proper divisors (1).

31906057 is an equidigital number, since it uses as much as digits as its factorization.

31906057 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5670, while the sum is 31.

The square root of 31906057 is about 5648.5446798268. The cubic root of 31906057 is about 317.1692283407.

The spelling of 31906057 in words is "thirty-one million, nine hundred six thousand, fifty-seven".