561564617 has 2 divisors, whose sum is σ = 561564618. Its totient is φ = 561564616.

The previous prime is 561564517. The next prime is 561564629. The reversal of 561564617 is 716465165.

561564617 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 350850361 + 210714256 = 18731^2 + 14516^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-561564617 is a prime.

It is not a weakly prime, because it can be changed into another prime (561564217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 280782308 + 280782309.

It is an arithmetic number, because the mean of its divisors is an integer number (280782309).

Almost surely, 2^561564617 is an apocalyptic number.

It is an amenable number.

561564617 is a deficient number, since it is larger than the sum of its proper divisors (1).

561564617 is an equidigital number, since it uses as much as digits as its factorization.

561564617 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 151200, while the sum is 41.

The square root of 561564617 is about 23697.3546413940. The cubic root of 561564617 is about 825.0239929355.

The spelling of 561564617 in words is "five hundred sixty-one million, five hundred sixty-four thousand, six hundred seventeen".