631308312589 has 2 divisors, whose sum is σ = 631308312590. Its totient is φ = 631308312588.

The previous prime is 631308312571. The next prime is 631308312637. The reversal of 631308312589 is 985213803136.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 596547693225 + 34760619364 = 772365^2 + 186442^2 .

It is a cyclic number.

It is not a de Polignac number, because 631308312589 - 2⁷ = 631308312461 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (631308312389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 315654156294 + 315654156295.

It is an arithmetic number, because the mean of its divisors is an integer number (315654156295).

Almost surely, 2^631308312589 is an apocalyptic number.

It is an amenable number.

631308312589 is a deficient number, since it is larger than the sum of its proper divisors (1).

631308312589 is an equidigital number, since it uses as much as digits as its factorization.

631308312589 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 933120, while the sum is 49.

The spelling of 631308312589 in words is "six hundred thirty-one billion, three hundred eight million, three hundred twelve thousand, five hundred eighty-nine".