631156855 has 16 divisors (see below), whose sum is σ = 867331584. Its totient is φ = 431920800.

The previous prime is 631156849. The next prime is 631156859. The reversal of 631156855 is 558651136.

It is not a de Polignac number, because 631156855 - 2³ = 631156847 is a prime.

It is a super-2 number, since 2×631156855² = 796717951226982050, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (631156859) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 321 + ... + 35530.

It is an arithmetic number, because the mean of its divisors is an integer number (54208224).

Almost surely, 2^631156855 is an apocalyptic number.

631156855 is a deficient number, since it is larger than the sum of its proper divisors (236174729).

631156855 is a wasteful number, since it uses less digits than its factorization.

631156855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36366.

The product of its digits is 108000, while the sum is 40.

The square root of 631156855 is about 25122.8353296359. The cubic root of 631156855 is about 857.7862910308.

The spelling of 631156855 in words is "six hundred thirty-one million, one hundred fifty-six thousand, eight hundred fifty-five".