631879157 has 12 divisors (see below), whose sum is σ = 791585676. Its totient is φ = 499947840.

The previous prime is 631879151. The next prime is 631879159. The reversal of 631879157 is 751978136.

It can be written as a sum of positive squares in 2 ways, for example, as 411237841 + 220641316 = 20279^2 + 14854^2 .

It is not a de Polignac number, because 631879157 - 2⁴ = 631879141 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (631879151) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 495344 + ... + 496617.

It is an arithmetic number, because the mean of its divisors is an integer number (65965473).

Almost surely, 2^631879157 is an apocalyptic number.

It is an amenable number.

631879157 is a deficient number, since it is larger than the sum of its proper divisors (159706519).

631879157 is a wasteful number, since it uses less digits than its factorization.

631879157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 991988 (or 991981 counting only the distinct ones).

The product of its digits is 317520, while the sum is 47.

The square root of 631879157 is about 25137.2066268311. The cubic root of 631879157 is about 858.1133859241.

The spelling of 631879157 in words is "six hundred thirty-one million, eight hundred seventy-nine thousand, one hundred fifty-seven".