631538150391 has 6 divisors (see below), whose sum is σ = 912221772800. Its totient is φ = 421025433588.

The previous prime is 631538150363. The next prime is 631538150479. The reversal of 631538150391 is 193051835136.

631538150391 is a `hidden beast` number, since 6 + 3 + 1 + 53 + 8 + 1 + 503 + 91 = 666.

It is a de Polignac number, because none of the positive numbers 2^k-631538150391 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (631538150311) 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 5 ways as a sum of consecutive naturals, for example, 35085452791 + ... + 35085452808.

Almost surely, 2^631538150391 is an apocalyptic number.

631538150391 is a deficient number, since it is larger than the sum of its proper divisors (280683622409).

631538150391 is a wasteful number, since it uses less digits than its factorization.

631538150391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70170905605 (or 70170905602 counting only the distinct ones).

The product of its (nonzero) digits is 291600, while the sum is 45.

The spelling of 631538150391 in words is "six hundred thirty-one billion, five hundred thirty-eight million, one hundred fifty thousand, three hundred ninety-one".