631297657997 has 4 divisors (see below), whose sum is σ = 637089379740. Its totient is φ = 625505936256.

The previous prime is 631297657919. The next prime is 631297658053. The reversal of 631297657997 is 799756792136.

631297657997 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 279813492676 + 351484165321 = 528974^2 + 592861^2 .

It is a cyclic number.

It is not a de Polignac number, because 631297657997 - 2⁸ = 631297657741 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 631297657997.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (631297657897) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2895860708 + ... + 2895860925.

It is an arithmetic number, because the mean of its divisors is an integer number (159272344935).

Almost surely, 2^631297657997 is an apocalyptic number.

It is an amenable number.

631297657997 is a deficient number, since it is larger than the sum of its proper divisors (5791721743).

631297657997 is a wasteful number, since it uses less digits than its factorization.

631297657997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5791721742.

The product of its digits is 270050760, while the sum is 71.

The spelling of 631297657997 in words is "six hundred thirty-one billion, two hundred ninety-seven million, six hundred fifty-seven thousand, nine hundred ninety-seven".