631637957941 has 2 divisors, whose sum is σ = 631637957942. Its totient is φ = 631637957940.

The previous prime is 631637957939. The next prime is 631637957981. The reversal of 631637957941 is 149759736136.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 359665277841 + 271972680100 = 599721^2 + 521510^2 .

It is a cyclic number.

It is not a de Polignac number, because 631637957941 - 2¹ = 631637957939 is a prime.

Together with 631637957939, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 631637957941.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (631637957981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 315818978970 + 315818978971.

It is an arithmetic number, because the mean of its divisors is an integer number (315818978971).

Almost surely, 2^631637957941 is an apocalyptic number.

It is an amenable number.

631637957941 is a deficient number, since it is larger than the sum of its proper divisors (1).

631637957941 is an equidigital number, since it uses as much as digits as its factorization.

631637957941 is an evil number, because the sum of its binary digits is even.

The product of its digits is 25719120, while the sum is 61.

The spelling of 631637957941 in words is "six hundred thirty-one billion, six hundred thirty-seven million, nine hundred fifty-seven thousand, nine hundred forty-one".