639588961 has 16 divisors (see below), whose sum is σ = 704179008. Its totient is φ = 576102400.

The previous prime is 639588959. The next prime is 639588967. The reversal of 639588961 is 169885936.

It is a happy number.

639588961 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 639588961 - 2¹ = 639588959 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (639588967) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 658206 + ... + 659176.

It is an arithmetic number, because the mean of its divisors is an integer number (44011188).

Almost surely, 2^639588961 is an apocalyptic number.

It is an amenable number.

639588961 is a deficient number, since it is larger than the sum of its proper divisors (64590047).

639588961 is a wasteful number, since it uses less digits than its factorization.

639588961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1472.

The product of its digits is 2799360, while the sum is 55.

The square root of 639588961 is about 25290.0961049973. The cubic root of 639588961 is about 861.5893455272.

The spelling of 639588961 in words is "six hundred thirty-nine million, five hundred eighty-eight thousand, nine hundred sixty-one".