631578494997031 has 2 divisors, whose sum is σ = 631578494997032. Its totient is φ = 631578494997030.

The previous prime is 631578494996993. The next prime is 631578494997053. The reversal of 631578494997031 is 130799494875136.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 631578494997031 - 2³⁷ = 631441056043559 is a prime.

It is a super-2 number, since 2×631578494997031² (a number of 30 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (631578494997061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 315789247498515 + 315789247498516.

It is an arithmetic number, because the mean of its divisors is an integer number (315789247498516).

Almost surely, 2^{631578494997031} is an apocalyptic number.

631578494997031 is a deficient number, since it is larger than the sum of its proper divisors (1).

631578494997031 is an equidigital number, since it uses as much as digits as its factorization.

631578494997031 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1234517760, while the sum is 76.

The spelling of 631578494997031 in words is "six hundred thirty-one trillion, five hundred seventy-eight billion, four hundred ninety-four million, nine hundred ninety-seven thousand, thirty-one".