561805873 has 2 divisors, whose sum is σ = 561805874. Its totient is φ = 561805872.

The previous prime is 561805819. The next prime is 561805931. The reversal of 561805873 is 378508165.

561805873 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 can be written as a sum of positive squares in only one way, i.e., 561547809 + 258064 = 23697^2 + 508^2 .

It is a cyclic number.

It is not a de Polignac number, because 561805873 - 2¹⁷ = 561674801 is a prime.

It is not a weakly prime, because it can be changed into another prime (561806873) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 280902936 + 280902937.

It is an arithmetic number, because the mean of its divisors is an integer number (280902937).

Almost surely, 2^561805873 is an apocalyptic number.

It is an amenable number.

561805873 is a deficient number, since it is larger than the sum of its proper divisors (1).

561805873 is an equidigital number, since it uses as much as digits as its factorization.

561805873 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 201600, while the sum is 43.

The square root of 561805873 is about 23702.4444519969. Note that the first 4 decimals coincide. The cubic root of 561805873 is about 825.1421232958.

The spelling of 561805873 in words is "five hundred sixty-one million, eight hundred five thousand, eight hundred seventy-three".