631857997 has 16 divisors (see below), whose sum is σ = 656702640. Its totient is φ = 607606272.

The previous prime is 631857949. The next prime is 631858009. The reversal of 631857997 is 799758136.

631857997 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 8 ways, for example, as 149352841 + 482505156 = 12221^2 + 21966^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-631857997 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (631855997) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 761779 + ... + 762607.

It is an arithmetic number, because the mean of its divisors is an integer number (41043915).

Almost surely, 2^631857997 is an apocalyptic number.

It is an amenable number.

631857997 is a deficient number, since it is larger than the sum of its proper divisors (24844643).

631857997 is a wasteful number, since it uses less digits than its factorization.

631857997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1152.

The product of its digits is 2857680, while the sum is 55.

The square root of 631857997 is about 25136.7857332635. The cubic root of 631857997 is about 858.1038071506.

The spelling of 631857997 in words is "six hundred thirty-one million, eight hundred fifty-seven thousand, nine hundred ninety-seven".