957631991 has 2 divisors, whose sum is σ = 957631992. Its totient is φ = 957631990.

The previous prime is 957631967. The next prime is 957631999. The reversal of 957631991 is 199136759.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-957631991 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (957631999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 478815995 + 478815996.

It is an arithmetic number, because the mean of its divisors is an integer number (478815996).

Almost surely, 2^957631991 is an apocalyptic number.

957631991 is a deficient number, since it is larger than the sum of its proper divisors (1).

957631991 is an equidigital number, since it uses as much as digits as its factorization.

957631991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 459270, while the sum is 50.

The square root of 957631991 is about 30945.6295945001. The cubic root of 957631991 is about 985.6730490676.

The spelling of 957631991 in words is "nine hundred fifty-seven million, six hundred thirty-one thousand, nine hundred ninety-one".