641631885 has 16 divisors (see below), whose sum is σ = 1027515840. Its totient is φ = 341902080.

The previous prime is 641631877. The next prime is 641631929. The reversal of 641631885 is 588136146.

641631885 is digitally balanced in base 2 and base 6, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 641631885 - 2³ = 641631877 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 700 + ... + 35829.

It is an arithmetic number, because the mean of its divisors is an integer number (64219740).

Almost surely, 2^641631885 is an apocalyptic number.

It is an amenable number.

641631885 is a deficient number, since it is larger than the sum of its proper divisors (385883955).

641631885 is a wasteful number, since it uses less digits than its factorization.

641631885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37708.

The product of its digits is 138240, while the sum is 42.

The square root of 641631885 is about 25330.4537069512. The cubic root of 641631885 is about 862.5057105272.

The spelling of 641631885 in words is "six hundred forty-one million, six hundred thirty-one thousand, eight hundred eighty-five".