1561224859 has 2 divisors, whose sum is σ = 1561224860. Its totient is φ = 1561224858.

The previous prime is 1561224839. The next prime is 1561224871. The reversal of 1561224859 is 9584221651.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1561224859 - 2⁵ = 1561224827 is a prime.

It is not a weakly prime, because it can be changed into another prime (1561224839) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 780612429 + 780612430.

It is an arithmetic number, because the mean of its divisors is an integer number (780612430).

Almost surely, 2^1561224859 is an apocalyptic number.

1561224859 is a deficient number, since it is larger than the sum of its proper divisors (1).

1561224859 is an equidigital number, since it uses as much as digits as its factorization.

1561224859 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 172800, while the sum is 43.

The square root of 1561224859 is about 39512.3380604084. The cubic root of 1561224859 is about 1160.0814595490.

The spelling of 1561224859 in words is "one billion, five hundred sixty-one million, two hundred twenty-four thousand, eight hundred fifty-nine".