631312507009 has 2 divisors, whose sum is σ = 631312507010. Its totient is φ = 631312507008.

The previous prime is 631312506961. The next prime is 631312507013. The reversal of 631312507009 is 900705213136.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 359712057600 + 271600449409 = 599760^2 + 521153^2 .

It is a cyclic number.

It is not a de Polignac number, because 631312507009 - 2⁹ = 631312506497 is a prime.

It is not a weakly prime, because it can be changed into another prime (631312507019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 315656253504 + 315656253505.

It is an arithmetic number, because the mean of its divisors is an integer number (315656253505).

Almost surely, 2^631312507009 is an apocalyptic number.

It is an amenable number.

631312507009 is a deficient number, since it is larger than the sum of its proper divisors (1).

631312507009 is an equidigital number, since it uses as much as digits as its factorization.

631312507009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 34020, while the sum is 37.

The spelling of 631312507009 in words is "six hundred thirty-one billion, three hundred twelve million, five hundred seven thousand, nine".