8564921 has 4 divisors (see below), whose sum is σ = 8576592. Its totient is φ = 8553252.

The previous prime is 8564909. The next prime is 8564939. The reversal of 8564921 is 1294658.

8564921 is digitally balanced in base 3, 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, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8564921 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (8564981) 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, 4655 + ... + 6228.

It is an arithmetic number, because the mean of its divisors is an integer number (2144148).

Almost surely, 2^8564921 is an apocalyptic number.

It is an amenable number.

8564921 is a deficient number, since it is larger than the sum of its proper divisors (11671).

8564921 is a wasteful number, since it uses less digits than its factorization.

8564921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11670.

The product of its digits is 17280, while the sum is 35.

The square root of 8564921 is about 2926.5886284205. The cubic root of 8564921 is about 204.6010165618.

The spelling of 8564921 in words is "eight million, five hundred sixty-four thousand, nine hundred twenty-one".