31975457 has 2 divisors, whose sum is σ = 31975458. Its totient is φ = 31975456.

The previous prime is 31975439. The next prime is 31975481. The reversal of 31975457 is 75457913.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25090081 + 6885376 = 5009^2 + 2624^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31975457 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (31975057) 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, 15987728 + 15987729.

It is an arithmetic number, because the mean of its divisors is an integer number (15987729).

Almost surely, 2^31975457 is an apocalyptic number.

It is an amenable number.

31975457 is a deficient number, since it is larger than the sum of its proper divisors (1).

31975457 is an equidigital number, since it uses as much as digits as its factorization.

31975457 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 132300, while the sum is 41.

The square root of 31975457 is about 5654.6845181672. The cubic root of 31975457 is about 317.3990238342.

The spelling of 31975457 in words is "thirty-one million, nine hundred seventy-five thousand, four hundred fifty-seven".