564989309 has 4 divisors (see below), whose sum is σ = 565069404. Its totient is φ = 564909216.

The previous prime is 564989287. The next prime is 564989317. The reversal of 564989309 is 903989465.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 214476025 + 350513284 = 14645^2 + 18722^2 .

It is a cyclic number.

It is not a de Polignac number, because 564989309 - 2⁸ = 564989053 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 (564989329) 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, 28322 + ... + 43955.

It is an arithmetic number, because the mean of its divisors is an integer number (141267351).

Almost surely, 2^564989309 is an apocalyptic number.

It is an amenable number.

564989309 is a deficient number, since it is larger than the sum of its proper divisors (80095).

564989309 is an equidigital number, since it uses as much as digits as its factorization.

564989309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80094.

The product of its (nonzero) digits is 2099520, while the sum is 53.

The square root of 564989309 is about 23769.5037600704. The cubic root of 564989309 is about 826.6977265869.

The spelling of 564989309 in words is "five hundred sixty-four million, nine hundred eighty-nine thousand, three hundred nine".