631313256 has 96 divisors (see below), whose sum is σ = 1862066880. Its totient is φ = 177811200.

The previous prime is 631313251. The next prime is 631313279. The reversal of 631313256 is 652313136.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (631313251) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 79716 + ... + 87276.

It is an arithmetic number, because the mean of its divisors is an integer number (19396530).

Almost surely, 2^631313256 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 631313256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (931033440).

631313256 is an abundant number, since it is smaller than the sum of its proper divisors (1230753624).

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

631313256 is a wasteful number, since it uses less digits than its factorization.

631313256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7655 (or 7644 counting only the distinct ones).

The product of its digits is 9720, while the sum is 30.

The square root of 631313256 is about 25125.9478627175. The cubic root of 631313256 is about 857.8571384769.

The spelling of 631313256 in words is "six hundred thirty-one million, three hundred thirteen thousand, two hundred fifty-six".