564921 has 32 divisors (see below), whose sum is σ = 992000. Its totient is φ = 317520.

The previous prime is 564919. The next prime is 564923. The reversal of 564921 is 129465.

It is an interprime number because it is at equal distance from previous prime (564919) and next prime (564923).

It is not a de Polignac number, because 564921 - 2¹ = 564919 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

564921 is a lucky number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 564921.

It is not an unprimeable number, because it can be changed into a prime (564923) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9231 + ... + 9291.

It is an arithmetic number, because the mean of its divisors is an integer number (31000).

2⁵⁶⁴⁹²¹ is an apocalyptic number.

It is an amenable number.

564921 is a deficient number, since it is larger than the sum of its proper divisors (427079).

564921 is an equidigital number, since it uses as much as digits as its factorization.

564921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91 (or 71 counting only the distinct ones).

The product of its digits is 2160, while the sum is 27.

The square root of 564921 is about 751.6122670633. The cubic root of 564921 is about 82.6664408451. Note that the first 3 decimals are identical.

It can be divided in two parts, 564 and 921, that added together give a triangular number (1485 = T₅₄).

The spelling of 564921 in words is "five hundred sixty-four thousand, nine hundred twenty-one".