631239879 has 8 divisors (see below), whose sum is σ = 855918720. Its totient is φ = 413693816.

The previous prime is 631239857. The next prime is 631239901. The reversal of 631239879 is 978932136.

It is an interprime number because it is at equal distance from previous prime (631239857) and next prime (631239901).

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

It is a cyclic number.

It is not a de Polignac number, because 631239879 - 2¹² = 631235783 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (631239779) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1782987 + ... + 1783340.

It is an arithmetic number, because the mean of its divisors is an integer number (106989840).

Almost surely, 2^631239879 is an apocalyptic number.

631239879 is a deficient number, since it is larger than the sum of its proper divisors (224678841).

631239879 is a wasteful number, since it uses less digits than its factorization.

631239879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3566389.

The product of its digits is 489888, while the sum is 48.

The square root of 631239879 is about 25124.4876365668. The cubic root of 631239879 is about 857.8239011885.

The spelling of 631239879 in words is "six hundred thirty-one million, two hundred thirty-nine thousand, eight hundred seventy-nine".