631131735844 has 27 divisors (see below), whose sum is σ = 1108104289201. Its totient is φ = 314533892960.

The previous prime is 631131735821. The next prime is 631131735851. The reversal of 631131735844 is 448537131136.

It is a happy number.

The square root of 631131735844 is 794438.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 555528734244 + 75603001600 = 745338^2 + 274960^2 .

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 631131735794 and 631131735803.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 780137712 + ... + 780138520.

Almost surely, 2^631131735844 is an apocalyptic number.

631131735844 is the 794438-th square number.

It is an amenable number.

631131735844 is a deficient number, since it is larger than the sum of its proper divisors (476972553357).

631131735844 is an frugal number, since it uses more digits than its factorization.

631131735844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2604 (or 1302 counting only the distinct ones).

The product of its digits is 725760, while the sum is 46.

The spelling of 631131735844 in words is "six hundred thirty-one billion, one hundred thirty-one million, seven hundred thirty-five thousand, eight hundred forty-four".