631879917 has 8 divisors (see below), whose sum is σ = 843100224. Its totient is φ = 420956448.

The previous prime is 631879861. The next prime is 631879921. The reversal of 631879917 is 719978136.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 631879917 - 2¹⁵ = 631847149 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 631879917.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (631879957) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 69193 + ... + 77790.

It is an arithmetic number, because the mean of its divisors is an integer number (105387528).

Almost surely, 2^631879917 is an apocalyptic number.

It is an amenable number.

631879917 is a deficient number, since it is larger than the sum of its proper divisors (211220307).

631879917 is a wasteful number, since it uses less digits than its factorization.

631879917 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148419.

The product of its digits is 571536, while the sum is 51.

The square root of 631879917 is about 25137.2217438602. The cubic root of 631879917 is about 858.1137299592.

The spelling of 631879917 in words is "six hundred thirty-one million, eight hundred seventy-nine thousand, nine hundred seventeen".