631813103376709 has 2 divisors, whose sum is σ = 631813103376710. Its totient is φ = 631813103376708.

The previous prime is 631813103376671. The next prime is 631813103376713. The reversal of 631813103376709 is 907673301318136.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 376980473520225 + 254832629856484 = 19415985^2 + 15963478^2 .

It is a cyclic number.

It is not a de Polignac number, because 631813103376709 - 2³³ = 631804513442117 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (631813103376809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 315906551688354 + 315906551688355.

It is an arithmetic number, because the mean of its divisors is an integer number (315906551688355).

Almost surely, 2^{631813103376709} is an apocalyptic number.

It is an amenable number.

631813103376709 is a deficient number, since it is larger than the sum of its proper divisors (1).

631813103376709 is an equidigital number, since it uses as much as digits as its factorization.

631813103376709 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10287648, while the sum is 58.

The spelling of 631813103376709 in words is "six hundred thirty-one trillion, eight hundred thirteen billion, one hundred three million, three hundred seventy-six thousand, seven hundred nine".