631875394 has 4 divisors (see below), whose sum is σ = 947813094. Its totient is φ = 315937696.

The previous prime is 631875383. The next prime is 631875421. The reversal of 631875394 is 493578136.

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

It can be written as a sum of positive squares in only one way, i.e., 579124225 + 52751169 = 24065^2 + 7263^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 157968847 + ... + 157968850.

Almost surely, 2^631875394 is an apocalyptic number.

631875394 is a deficient number, since it is larger than the sum of its proper divisors (315937700).

631875394 is a wasteful number, since it uses less digits than its factorization.

631875394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 315937699.

The product of its digits is 544320, while the sum is 46.

The square root of 631875394 is about 25137.1317775119. The cubic root of 631875394 is about 858.1116824934. Note that the first 3 decimals are identical.

The spelling of 631875394 in words is "six hundred thirty-one million, eight hundred seventy-five thousand, three hundred ninety-four".