561919019 has 2 divisors, whose sum is σ = 561919020. Its totient is φ = 561919018.

The previous prime is 561919013. The next prime is 561919097. The reversal of 561919019 is 910919165.

561919019 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 561919019 - 2¹⁶ = 561853483 is a prime.

It is a super-2 number, since 2×561919019² = 631505967827844722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (561919013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 280959509 + 280959510.

It is an arithmetic number, because the mean of its divisors is an integer number (280959510).

Almost surely, 2^561919019 is an apocalyptic number.

561919019 is a deficient number, since it is larger than the sum of its proper divisors (1).

561919019 is an equidigital number, since it uses as much as digits as its factorization.

561919019 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21870, while the sum is 41.

The square root of 561919019 is about 23704.8311320709. The cubic root of 561919019 is about 825.1975132850.

The spelling of 561919019 in words is "five hundred sixty-one million, nine hundred nineteen thousand, nineteen".