561022321 has 4 divisors (see below), whose sum is σ = 594023652. Its totient is φ = 528020992.

The previous prime is 561022309. The next prime is 561022339. The reversal of 561022321 is 123220165.

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 481188096 + 79834225 = 21936^2 + 8935^2 .

It is a cyclic number.

It is not a de Polignac number, because 561022321 - 2⁹ = 561021809 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 561022292 and 561022301.

It is not an unprimeable number, because it can be changed into a prime (561022361) 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, 16500640 + ... + 16500673.

It is an arithmetic number, because the mean of its divisors is an integer number (148505913).

Almost surely, 2^561022321 is an apocalyptic number.

It is an amenable number.

561022321 is a deficient number, since it is larger than the sum of its proper divisors (33001331).

561022321 is a wasteful number, since it uses less digits than its factorization.

561022321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33001330.

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 561022321 is about 23685.9097566465. The cubic root of 561022321 is about 824.7583355837.

Adding to 561022321 its reverse (123220165), we get a palindrome (684242486).

The spelling of 561022321 in words is "five hundred sixty-one million, twenty-two thousand, three hundred twenty-one".