631378839 has 32 divisors (see below), whose sum is σ = 1040256000. Its totient is φ = 331702272.

The previous prime is 631378831. The next prime is 631378879. The reversal of 631378839 is 938873136.

It is not a de Polignac number, because 631378839 - 2³ = 631378831 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (631378831) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 65662 + ... + 74660.

It is an arithmetic number, because the mean of its divisors is an integer number (32508000).

Almost surely, 2^631378839 is an apocalyptic number.

631378839 is a deficient number, since it is larger than the sum of its proper divisors (408877161).

631378839 is a wasteful number, since it uses less digits than its factorization.

631378839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9279.

The product of its digits is 653184, while the sum is 48.

The square root of 631378839 is about 25127.2529139180. The cubic root of 631378839 is about 857.8868431684.

The spelling of 631378839 in words is "six hundred thirty-one million, three hundred seventy-eight thousand, eight hundred thirty-nine".