561559 has 2 divisors, whose sum is σ = 561560. Its totient is φ = 561558.

The previous prime is 561553. The next prime is 561599. The reversal of 561559 is 955165.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 561559 - 2³ = 561551 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 561559.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (561551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 280779 + 280780.

It is an arithmetic number, because the mean of its divisors is an integer number (280780).

2⁵⁶¹⁵⁵⁹ is an apocalyptic number.

561559 is a deficient number, since it is larger than the sum of its proper divisors (1).

561559 is an equidigital number, since it uses as much as digits as its factorization.

561559 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6750, while the sum is 31.

The square root of 561559 is about 749.3724040822. The cubic root of 561559 is about 82.5021242183.

The spelling of 561559 in words is "five hundred sixty-one thousand, five hundred fifty-nine".