561522217 has 2 divisors, whose sum is σ = 561522218. Its totient is φ = 561522216.

The previous prime is 561522191. The next prime is 561522229. The reversal of 561522217 is 712225165.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 499254336 + 62267881 = 22344^2 + 7891^2 .

It is a cyclic number.

It is not a de Polignac number, because 561522217 - 2¹⁹ = 560997929 is a prime.

It is not a weakly prime, because it can be changed into another prime (561522277) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 280761108 + 280761109.

It is an arithmetic number, because the mean of its divisors is an integer number (280761109).

Almost surely, 2^561522217 is an apocalyptic number.

It is an amenable number.

561522217 is a deficient number, since it is larger than the sum of its proper divisors (1).

561522217 is an equidigital number, since it uses as much as digits as its factorization.

561522217 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8400, while the sum is 31.

The square root of 561522217 is about 23696.4600098833. The cubic root of 561522217 is about 825.0032283926.

The spelling of 561522217 in words is "five hundred sixty-one million, five hundred twenty-two thousand, two hundred seventeen".