631637379097 has 2 divisors, whose sum is σ = 631637379098. Its totient is φ = 631637379096.

The previous prime is 631637379071. The next prime is 631637379161. The reversal of 631637379097 is 790973736136.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 598927401216 + 32709977881 = 773904^2 + 180859^2 .

It is a cyclic number.

It is not a de Polignac number, because 631637379097 - 2⁷ = 631637378969 is a prime.

It is not a weakly prime, because it can be changed into another prime (631637370097) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 315818689548 + 315818689549.

It is an arithmetic number, because the mean of its divisors is an integer number (315818689549).

Almost surely, 2^631637379097 is an apocalyptic number.

It is an amenable number.

631637379097 is a deficient number, since it is larger than the sum of its proper divisors (1).

631637379097 is an equidigital number, since it uses as much as digits as its factorization.

631637379097 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27005076, while the sum is 61.

The spelling of 631637379097 in words is "six hundred thirty-one billion, six hundred thirty-seven million, three hundred seventy-nine thousand, ninety-seven".