564486721 has 4 divisors (see below), whose sum is σ = 564763732. Its totient is φ = 564209712.

The previous prime is 564486697. The next prime is 564486743. The reversal of 564486721 is 127684465.

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 370023696 + 194463025 = 19236^2 + 13945^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-564486721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (564406721) 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 3 ways as a sum of consecutive naturals, for example, 135426 + ... + 139531.

It is an arithmetic number, because the mean of its divisors is an integer number (141190933).

Almost surely, 2^564486721 is an apocalyptic number.

It is an amenable number.

564486721 is a deficient number, since it is larger than the sum of its proper divisors (277011).

564486721 is a wasteful number, since it uses less digits than its factorization.

564486721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 277010.

The product of its digits is 322560, while the sum is 43.

The square root of 564486721 is about 23758.9292898481. The cubic root of 564486721 is about 826.4525233527.

The spelling of 564486721 in words is "five hundred sixty-four million, four hundred eighty-six thousand, seven hundred twenty-one".