631938195013 has 2 divisors, whose sum is σ = 631938195014. Its totient is φ = 631938195012.

The previous prime is 631938194977. The next prime is 631938195023. The reversal of 631938195013 is 310591839136.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 629670816324 + 2267378689 = 793518^2 + 47617^2 .

It is a cyclic number.

It is not a de Polignac number, because 631938195013 - 2⁹ = 631938194501 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (631938195023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 315969097506 + 315969097507.

It is an arithmetic number, because the mean of its divisors is an integer number (315969097507).

Almost surely, 2^631938195013 is an apocalyptic number.

It is an amenable number.

631938195013 is a deficient number, since it is larger than the sum of its proper divisors (1).

631938195013 is an equidigital number, since it uses as much as digits as its factorization.

631938195013 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 524880, while the sum is 49.

The spelling of 631938195013 in words is "six hundred thirty-one billion, nine hundred thirty-eight million, one hundred ninety-five thousand, thirteen".