641913587 has 4 divisors (see below), whose sum is σ = 733615536. Its totient is φ = 550211640.

The previous prime is 641913583. The next prime is 641913593. The reversal of 641913587 is 785319146.

641913587 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 641913587 - 2² = 641913583 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (641913583) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 45850964 + ... + 45850977.

It is an arithmetic number, because the mean of its divisors is an integer number (183403884).

Almost surely, 2^641913587 is an apocalyptic number.

641913587 is a deficient number, since it is larger than the sum of its proper divisors (91701949).

641913587 is an equidigital number, since it uses as much as digits as its factorization.

641913587 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91701948.

The product of its digits is 181440, while the sum is 44.

The square root of 641913587 is about 25336.0136367188. The cubic root of 641913587 is about 862.6319168667.

The spelling of 641913587 in words is "six hundred forty-one million, nine hundred thirteen thousand, five hundred eighty-seven".