631313138818 has 8 divisors (see below), whose sum is σ = 946989308412. Its totient is φ = 315650036016.

The previous prime is 631313138803. The next prime is 631313138873. The reversal of 631313138818 is 818831313136.

It can be written as a sum of positive squares in 2 ways, for example, as 535951375569 + 95361763249 = 732087^2 + 308807^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3145005 + ... + 3339712.

Almost surely, 2^631313138818 is an apocalyptic number.

631313138818 is a deficient number, since it is larger than the sum of its proper divisors (315676169594).

631313138818 is a wasteful number, since it uses less digits than its factorization.

631313138818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6533396.

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

The spelling of 631313138818 in words is "six hundred thirty-one billion, three hundred thirteen million, one hundred thirty-eight thousand, eight hundred eighteen".