631539725 has 24 divisors (see below), whose sum is σ = 791907648. Its totient is φ = 499593600.

The previous prime is 631539709. The next prime is 631539731. The reversal of 631539725 is 527935136.

It is a happy number.

It is not a de Polignac number, because 631539725 - 2⁴ = 631539709 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1381697 + ... + 1382153.

It is an arithmetic number, because the mean of its divisors is an integer number (32996152).

Almost surely, 2^631539725 is an apocalyptic number.

It is an amenable number.

631539725 is a deficient number, since it is larger than the sum of its proper divisors (160367923).

631539725 is a wasteful number, since it uses less digits than its factorization.

631539725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 965 (or 960 counting only the distinct ones).

The product of its digits is 170100, while the sum is 41.

The square root of 631539725 is about 25130.4541343765. The cubic root of 631539725 is about 857.9597050026.

The spelling of 631539725 in words is "six hundred thirty-one million, five hundred thirty-nine thousand, seven hundred twenty-five".