957139681 has 2 divisors, whose sum is σ = 957139682. Its totient is φ = 957139680.

The previous prime is 957139679. The next prime is 957139699. The reversal of 957139681 is 186931759.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 706709056 + 250430625 = 26584^2 + 15825^2 .

It is a cyclic number.

It is not a de Polignac number, because 957139681 - 2¹ = 957139679 is a prime.

It is a super-2 number, since 2×957139681² = 1832232737889563522, which contains 22 as substring.

Together with 957139679, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (957136681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 478569840 + 478569841.

It is an arithmetic number, because the mean of its divisors is an integer number (478569841).

Almost surely, 2^957139681 is an apocalyptic number.

It is an amenable number.

957139681 is a deficient number, since it is larger than the sum of its proper divisors (1).

957139681 is an equidigital number, since it uses as much as digits as its factorization.

957139681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 408240, while the sum is 49.

The square root of 957139681 is about 30937.6741368837. The cubic root of 957139681 is about 985.5041115625.

The spelling of 957139681 in words is "nine hundred fifty-seven million, one hundred thirty-nine thousand, six hundred eighty-one".