631881694 has 4 divisors (see below), whose sum is σ = 947822544. Its totient is φ = 315940846.

The previous prime is 631881683. The next prime is 631881703. The reversal of 631881694 is 496188136.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 157970422 + ... + 157970425.

It is an arithmetic number, because the mean of its divisors is an integer number (236955636).

Almost surely, 2^631881694 is an apocalyptic number.

631881694 is a deficient number, since it is larger than the sum of its proper divisors (315940850).

631881694 is a wasteful number, since it uses less digits than its factorization.

631881694 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 315940849.

The product of its digits is 248832, while the sum is 46.

The square root of 631881694 is about 25137.2570898259. The cubic root of 631881694 is about 858.1145343666.

The spelling of 631881694 in words is "six hundred thirty-one million, eight hundred eighty-one thousand, six hundred ninety-four".