631521040 has 40 divisors (see below), whose sum is σ = 1472191488. Its totient is φ = 251936640.

The previous prime is 631521019. The next prime is 631521053. The reversal of 631521040 is 40125136.

It is a tau number, because it is divible by the number of its divisors (40).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20335 + ... + 40945.

Almost surely, 2^631521040 is an apocalyptic number.

It is an amenable number.

631521040 is an abundant number, since it is smaller than the sum of its proper divisors (840670448).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

631521040 is a wasteful number, since it uses less digits than its factorization.

631521040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21007 (or 21001 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 631521040 is about 25130.0823715323. The cubic root of 631521040 is about 857.9512436003.

Adding to 631521040 its reverse (40125136), we get a palindrome (671646176).

The spelling of 631521040 in words is "six hundred thirty-one million, five hundred twenty-one thousand, forty".