1561000559 has 2 divisors, whose sum is σ = 1561000560. Its totient is φ = 1561000558.

The previous prime is 1561000531. The next prime is 1561000591. The reversal of 1561000559 is 9550001651.

It is an a-pointer prime, because the next prime (1561000591) can be obtained adding 1561000559 to its sum of digits (32).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1561000559 - 2²⁰ = 1559951983 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1561000159) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 780500279 + 780500280.

It is an arithmetic number, because the mean of its divisors is an integer number (780500280).

Almost surely, 2^1561000559 is an apocalyptic number.

1561000559 is a deficient number, since it is larger than the sum of its proper divisors (1).

1561000559 is an equidigital number, since it uses as much as digits as its factorization.

1561000559 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6750, while the sum is 32.

The square root of 1561000559 is about 39509.4996045255. The cubic root of 1561000559 is about 1160.0259008783.

The spelling of 1561000559 in words is "one billion, five hundred sixty-one million, five hundred fifty-nine", and thus it is an aban number.