641021605 has 8 divisors (see below), whose sum is σ = 879115392. Its totient is φ = 439557648.

The previous prime is 641021599. The next prime is 641021617. The reversal of 641021605 is 506120146.

641021605 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 cyclic number.

It is not a de Polignac number, because 641021605 - 2¹¹ = 641019557 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 641021605.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9157417 + ... + 9157486.

It is an arithmetic number, because the mean of its divisors is an integer number (109889424).

Almost surely, 2^641021605 is an apocalyptic number.

It is an amenable number.

641021605 is a deficient number, since it is larger than the sum of its proper divisors (238093787).

641021605 is a wasteful number, since it uses less digits than its factorization.

641021605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18314915.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 641021605 is about 25318.4044718462. The cubic root of 641021605 is about 862.2321700081.

The spelling of 641021605 in words is "six hundred forty-one million, twenty-one thousand, six hundred five".