631938194977 has 2 divisors, whose sum is σ = 631938194978. Its totient is φ = 631938194976.

The previous prime is 631938194963. The next prime is 631938195013. The reversal of 631938194977 is 779491839136.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 508838262241 + 123099932736 = 713329^2 + 350856^2 .

It is a cyclic number.

It is not a de Polignac number, because 631938194977 - 2²⁷ = 631803977249 is a prime.

It is not a weakly prime, because it can be changed into another prime (631938194777) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 315969097488 + 315969097489.

It is an arithmetic number, because the mean of its divisors is an integer number (315969097489).

Almost surely, 2^631938194977 is an apocalyptic number.

It is an amenable number.

631938194977 is a deficient number, since it is larger than the sum of its proper divisors (1).

631938194977 is an equidigital number, since it uses as much as digits as its factorization.

631938194977 is an evil number, because the sum of its binary digits is even.

The product of its digits is 61725888, while the sum is 67.

The spelling of 631938194977 in words is "six hundred thirty-one billion, nine hundred thirty-eight million, one hundred ninety-four thousand, nine hundred seventy-seven".