631197812131 has 2 divisors, whose sum is σ = 631197812132. Its totient is φ = 631197812130.

The previous prime is 631197812081. The next prime is 631197812153. The reversal of 631197812131 is 131218791136.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 631197812131 - 2⁹ = 631197811619 is a prime.

It is a super-3 number, since 3×631197812131³ (a number of 36 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not a weakly prime, because it can be changed into another prime (631197812831) 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, 315598906065 + 315598906066.

It is an arithmetic number, because the mean of its divisors is an integer number (315598906066).

Almost surely, 2^631197812131 is an apocalyptic number.

631197812131 is a deficient number, since it is larger than the sum of its proper divisors (1).

631197812131 is an equidigital number, since it uses as much as digits as its factorization.

631197812131 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 54432, while the sum is 43.

The spelling of 631197812131 in words is "six hundred thirty-one billion, one hundred ninety-seven million, eight hundred twelve thousand, one hundred thirty-one".