631841256 has 128 divisors (see below), whose sum is σ = 1828454400. Its totient is φ = 201942720.

The previous prime is 631841239. The next prime is 631841263. The reversal of 631841256 is 652148136.

It is a happy number.

631841256 is a `hidden beast` number, since 631 + 8 + 4 + 12 + 5 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 631841256.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 850021 + ... + 850763.

It is an arithmetic number, because the mean of its divisors is an integer number (14284800).

Almost surely, 2^631841256 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 631841256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (914227200).

631841256 is an abundant number, since it is smaller than the sum of its proper divisors (1196613144).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

631841256 is a wasteful number, since it uses less digits than its factorization.

631841256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 916 (or 906 counting only the distinct ones).

The product of its digits is 34560, while the sum is 36.

The square root of 631841256 is about 25136.4527330330. The cubic root of 631841256 is about 858.0962286320.

It can be divided in two parts, 6318 and 41256, that added together give a palindrome (47574).

The spelling of 631841256 in words is "six hundred thirty-one million, eight hundred forty-one thousand, two hundred fifty-six".