631986025 has 36 divisors (see below), whose sum is σ = 865186812. Its totient is φ = 457600000.

The previous prime is 631985983. The next prime is 631986029. The reversal of 631986025 is 520689136.

It can be written as a sum of positive squares in 6 ways, for example, as 5184729 + 626801296 = 2277^2 + 25036^2 .

It is not a de Polignac number, because 631986025 - 2¹¹ = 631983977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (631986029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 1212765 + ... + 1213285.

It is an arithmetic number, because the mean of its divisors is an integer number (24032967).

Almost surely, 2^631986025 is an apocalyptic number.

It is an amenable number.

631986025 is a deficient number, since it is larger than the sum of its proper divisors (233200787).

631986025 is a wasteful number, since it uses less digits than its factorization.

631986025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 954 (or 938 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 40.

The square root of 631986025 is about 25139.3322305904. The cubic root of 631986025 is about 858.1617599900.

The spelling of 631986025 in words is "six hundred thirty-one million, nine hundred eighty-six thousand, twenty-five".