631597697 has 2 divisors, whose sum is σ = 631597698. Its totient is φ = 631597696.

The previous prime is 631597693. The next prime is 631597709. The reversal of 631597697 is 796795136.

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., 627452401 + 4145296 = 25049^2 + 2036^2 .

It is a cyclic number.

It is not a de Polignac number, because 631597697 - 2² = 631597693 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (631597693) 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, 315798848 + 315798849.

It is an arithmetic number, because the mean of its divisors is an integer number (315798849).

Almost surely, 2^631597697 is an apocalyptic number.

It is an amenable number.

631597697 is a deficient number, since it is larger than the sum of its proper divisors (1).

631597697 is an equidigital number, since it uses as much as digits as its factorization.

631597697 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2143260, while the sum is 53.

The square root of 631597697 is about 25131.6075291653. The cubic root of 631597697 is about 857.9859562508.

The spelling of 631597697 in words is "six hundred thirty-one million, five hundred ninety-seven thousand, six hundred ninety-seven".