565320221 has 8 divisors (see below), whose sum is σ = 572987520. Its totient is φ = 557673472.

The previous prime is 565320199. The next prime is 565320317. The reversal of 565320221 is 122023565.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 565320221 - 2¹⁰ = 565319197 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (565320121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 54941 + ... + 64413.

It is an arithmetic number, because the mean of its divisors is an integer number (71623440).

Almost surely, 2^565320221 is an apocalyptic number.

It is an amenable number.

565320221 is a deficient number, since it is larger than the sum of its proper divisors (7667299).

565320221 is an equidigital number, since it uses as much as digits as its factorization.

565320221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10275.

The product of its (nonzero) digits is 3600, while the sum is 26.

The square root of 565320221 is about 23776.4635932260. The cubic root of 565320221 is about 826.8590929483.

Adding to 565320221 its reverse (122023565), we get a palindrome (687343786).

The spelling of 565320221 in words is "five hundred sixty-five million, three hundred twenty thousand, two hundred twenty-one".