3909564621 has 24 divisors (see below), whose sum is σ = 5997001920. Its totient is φ = 2447335296.

The previous prime is 3909564611. The next prime is 3909564653. The reversal of 3909564621 is 1264659093.

3909564621 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 3909564621 - 2¹⁸ = 3909302477 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3909564611) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 81841 + ... + 120486.

It is an arithmetic number, because the mean of its divisors is an integer number (249875080).

Almost surely, 2^3909564621 is an apocalyptic number.

It is an amenable number.

3909564621 is a deficient number, since it is larger than the sum of its proper divisors (2087437299).

3909564621 is a wasteful number, since it uses less digits than its factorization.

3909564621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 202465 (or 202462 counting only the distinct ones).

The product of its (nonzero) digits is 349920, while the sum is 45.

The square root of 3909564621 is about 62526.5113451886. The cubic root of 3909564621 is about 1575.3466435803.

The spelling of 3909564621 in words is "three billion, nine hundred nine million, five hundred sixty-four thousand, six hundred twenty-one".