631876979 has 4 divisors (see below), whose sum is σ = 642235680. Its totient is φ = 621518280.

The previous prime is 631876919. The next prime is 631877003. The reversal of 631876979 is 979678136.

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

It is a cyclic number.

It is not a de Polignac number, because 631876979 - 2¹² = 631872883 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (631876919) 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 3 ways as a sum of consecutive naturals, for example, 5179259 + ... + 5179380.

It is an arithmetic number, because the mean of its divisors is an integer number (160558920).

Almost surely, 2^631876979 is an apocalyptic number.

631876979 is a deficient number, since it is larger than the sum of its proper divisors (10358701).

631876979 is a wasteful number, since it uses less digits than its factorization.

631876979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10358700.

The product of its digits is 3429216, while the sum is 56.

The square root of 631876979 is about 25137.1633045577. The cubic root of 631876979 is about 858.1123999903.

The spelling of 631876979 in words is "six hundred thirty-one million, eight hundred seventy-six thousand, nine hundred seventy-nine".