631637372117 has 2 divisors, whose sum is σ = 631637372118. Its totient is φ = 631637372116.

The previous prime is 631637372101. The next prime is 631637372147. The reversal of 631637372117 is 711273736136.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 533964871441 + 97672500676 = 730729^2 + 312526^2 .

It is a cyclic number.

It is not a de Polignac number, because 631637372117 - 2⁴ = 631637372101 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (631637372147) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 315818686058 + 315818686059.

It is an arithmetic number, because the mean of its divisors is an integer number (315818686059).

Almost surely, 2^631637372117 is an apocalyptic number.

It is an amenable number.

631637372117 is a deficient number, since it is larger than the sum of its proper divisors (1).

631637372117 is an equidigital number, since it uses as much as digits as its factorization.

631637372117 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 666792, while the sum is 47.

The spelling of 631637372117 in words is "six hundred thirty-one billion, six hundred thirty-seven million, three hundred seventy-two thousand, one hundred seventeen".