631126969225 has 27 divisors (see below), whose sum is σ = 796382348053. Its totient is φ = 496159612640.

The previous prime is 631126969201. The next prime is 631126969267. The reversal of 631126969225 is 522969621136.

The square root of 631126969225 is 794435.

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

It can be written as a sum of positive squares in 4 ways, for example, as 33387694729 + 597739274496 = 182723^2 + 773136^2 .

It is not a de Polignac number, because 631126969225 - 2²¹ = 631124872073 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 234356979 + ... + 234359671.

Almost surely, 2^631126969225 is an apocalyptic number.

631126969225 is the 794435-th square number.

631126969225 is the 397218-th centered octagonal number.

It is an amenable number.

631126969225 is a deficient number, since it is larger than the sum of its proper divisors (165255378828).

631126969225 is an frugal number, since it uses more digits than its factorization.

631126969225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5514 (or 2757 counting only the distinct ones).

The product of its digits is 2099520, while the sum is 52.

The spelling of 631126969225 in words is "six hundred thirty-one billion, one hundred twenty-six million, nine hundred sixty-nine thousand, two hundred twenty-five".