641565901 has 8 divisors (see below), whose sum is σ = 659785824. Its totient is φ = 623572560.

The previous prime is 641565889. The next prime is 641565919. The reversal of 641565901 is 109565146.

641565901 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-641565901 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641565961) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 50895 + ... + 62236.

It is an arithmetic number, because the mean of its divisors is an integer number (82473228).

Almost surely, 2^641565901 is an apocalyptic number.

It is an amenable number.

641565901 is a deficient number, since it is larger than the sum of its proper divisors (18219923).

641565901 is a wasteful number, since it uses less digits than its factorization.

641565901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113291.

The product of its (nonzero) digits is 32400, while the sum is 37.

The square root of 641565901 is about 25329.1512096241. The cubic root of 641565901 is about 862.4761434555.

The spelling of 641565901 in words is "six hundred forty-one million, five hundred sixty-five thousand, nine hundred one".