561560557 has 2 divisors, whose sum is σ = 561560558. Its totient is φ = 561560556.

The previous prime is 561560539. The next prime is 561560569. The reversal of 561560557 is 755065165.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 533194281 + 28366276 = 23091^2 + 5326^2 .

It is a cyclic number.

It is not a de Polignac number, because 561560557 - 2¹⁹ = 561036269 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (561560357) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 280780278 + 280780279.

It is an arithmetic number, because the mean of its divisors is an integer number (280780279).

Almost surely, 2^561560557 is an apocalyptic number.

It is an amenable number.

561560557 is a deficient number, since it is larger than the sum of its proper divisors (1).

561560557 is an equidigital number, since it uses as much as digits as its factorization.

561560557 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 157500, while the sum is 40.

The square root of 561560557 is about 23697.2689776691. The cubic root of 561560557 is about 825.0220046778.

The spelling of 561560557 in words is "five hundred sixty-one million, five hundred sixty thousand, five hundred fifty-seven".