564001621 has 4 divisors (see below), whose sum is σ = 566836000. Its totient is φ = 561167244.

The previous prime is 564001597. The next prime is 564001637. The reversal of 564001621 is 126100465.

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 not a de Polignac number, because 564001621 - 2²⁵ = 530447189 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 (564001661) 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, 1416891 + ... + 1417288.

It is an arithmetic number, because the mean of its divisors is an integer number (141709000).

Almost surely, 2^564001621 is an apocalyptic number.

It is an amenable number.

564001621 is a deficient number, since it is larger than the sum of its proper divisors (2834379).

564001621 is a wasteful number, since it uses less digits than its factorization.

564001621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2834378.

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

The square root of 564001621 is about 23748.7183022579. The cubic root of 564001621 is about 826.2157141109.

The spelling of 564001621 in words is "five hundred sixty-four million, one thousand, six hundred twenty-one".