631439425 has 12 divisors (see below), whose sum is σ = 791785260. Its totient is φ = 499473920.

The previous prime is 631439411. The next prime is 631439429. The reversal of 631439425 is 524934136.

It can be written as a sum of positive squares in 6 ways, for example, as 94497841 + 536941584 = 9721^2 + 23172^2 .

It is not a de Polignac number, because 631439425 - 2¹⁹ = 630915137 is a prime.

It is not an unprimeable number, because it can be changed into a prime (631439429) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 139672 + ... + 144121.

It is an arithmetic number, because the mean of its divisors is an integer number (65982105).

Almost surely, 2^631439425 is an apocalyptic number.

It is an amenable number.

631439425 is a deficient number, since it is larger than the sum of its proper divisors (160345835).

631439425 is a wasteful number, since it uses less digits than its factorization.

631439425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 283892 (or 283887 counting only the distinct ones).

The product of its digits is 77760, while the sum is 37.

The square root of 631439425 is about 25128.4584684377. The cubic root of 631439425 is about 857.9142827270.

The spelling of 631439425 in words is "six hundred thirty-one million, four hundred thirty-nine thousand, four hundred twenty-five".