561557317 has 2 divisors, whose sum is σ = 561557318. Its totient is φ = 561557316.

The previous prime is 561557263. The next prime is 561557323. The reversal of 561557317 is 713755165.

561557317 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., 359519521 + 202037796 = 18961^2 + 14214^2 .

It is a cyclic number.

It is not a de Polignac number, because 561557317 - 2¹⁹ = 561033029 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 561557317.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (561557327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 280778658 + 280778659.

It is an arithmetic number, because the mean of its divisors is an integer number (280778659).

Almost surely, 2^561557317 is an apocalyptic number.

It is an amenable number.

561557317 is a deficient number, since it is larger than the sum of its proper divisors (1).

561557317 is an equidigital number, since it uses as much as digits as its factorization.

561557317 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 110250, while the sum is 40.

The square root of 561557317 is about 23697.2006152626. The cubic root of 561557317 is about 825.0204179826.

The spelling of 561557317 in words is "five hundred sixty-one million, five hundred fifty-seven thousand, three hundred seventeen".