560221561 has 3 divisors (see below), whose sum is σ = 560245231. Its totient is φ = 560197892.

The previous prime is 560221559. The next prime is 560221573. The reversal of 560221561 is 165122065.

The square root of 560221561 is 23669.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 192349161 + 367872400 = 13869^2 + 19180^2 .

It is not a de Polignac number, because 560221561 - 2¹ = 560221559 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (560221591) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 11835 + ... + 35503.

Almost surely, 2^560221561 is an apocalyptic number.

560221561 is the 23669-th square number.

560221561 is the 11835-th centered octagonal number.

It is an amenable number.

560221561 is a deficient number, since it is larger than the sum of its proper divisors (23670).

560221561 is an frugal number, since it uses more digits than its factorization.

560221561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47338 (or 23669 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 28.

The cubic root of 560221561 is about 824.3657499255.

Multiplying 560221561 by its product of nonzero digits (3600), we get a square (2016797619600 = 1420140²).

The spelling of 560221561 in words is "five hundred sixty million, two hundred twenty-one thousand, five hundred sixty-one".