631637379161 has 2 divisors, whose sum is σ = 631637379162. Its totient is φ = 631637379160.

The previous prime is 631637379097. The next prime is 631637379179. The reversal of 631637379161 is 161973736136.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 628184641561 + 3452737600 = 792581^2 + 58760^2 .

It is a cyclic number.

It is not a de Polignac number, because 631637379161 - 2⁶ = 631637379097 is a prime.

It is not a weakly prime, because it can be changed into another prime (631637373161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 315818689580 + 315818689581.

It is an arithmetic number, because the mean of its divisors is an integer number (315818689581).

Almost surely, 2^631637379161 is an apocalyptic number.

It is an amenable number.

631637379161 is a deficient number, since it is larger than the sum of its proper divisors (1).

631637379161 is an equidigital number, since it uses as much as digits as its factorization.

631637379161 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2571912, while the sum is 53.

The spelling of 631637379161 in words is "six hundred thirty-one billion, six hundred thirty-seven million, three hundred seventy-nine thousand, one hundred sixty-one".