631383816899331 has 12 divisors (see below), whose sum is σ = 912066467393952. Its totient is φ = 420891335017296.

The previous prime is 631383816899327. The next prime is 631383816899393. The reversal of 631383816899331 is 133998618383136.

631383816899331 is a `hidden beast` number, since 6 + 3 + 1 + 383 + 81 + 6 + 89 + 93 + 3 + 1 = 666.

It is not a de Polignac number, because 631383816899331 - 2² = 631383816899327 is a prime.

It is a super-2 number, since 2×631383816899331² (a number of 30 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 631383816899331.

It is not an unprimeable number, because it can be changed into a prime (631383816899831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2600670396 + ... + 2600913161.

It is an arithmetic number, because the mean of its divisors is an integer number (76005538949496).

Almost surely, 2^{631383816899331} is an apocalyptic number.

631383816899331 is a deficient number, since it is larger than the sum of its proper divisors (280682650494621).

631383816899331 is a wasteful number, since it uses less digits than its factorization.

631383816899331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5201597050 (or 5201597047 counting only the distinct ones).

The product of its digits is 362797056, while the sum is 72.

The spelling of 631383816899331 in words is "six hundred thirty-one trillion, three hundred eighty-three billion, eight hundred sixteen million, eight hundred ninety-nine thousand, three hundred thirty-one".