561773609 has 2 divisors, whose sum is σ = 561773610. Its totient is φ = 561773608.

The previous prime is 561773603. The next prime is 561773623. The reversal of 561773609 is 906377165.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 298425625 + 263347984 = 17275^2 + 16228^2 .

It is a cyclic number.

It is not a de Polignac number, because 561773609 - 2⁸ = 561773353 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 561773609.

It is not a weakly prime, because it can be changed into another prime (561773603) 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, 280886804 + 280886805.

It is an arithmetic number, because the mean of its divisors is an integer number (280886805).

Almost surely, 2^561773609 is an apocalyptic number.

It is an amenable number.

561773609 is a deficient number, since it is larger than the sum of its proper divisors (1).

561773609 is an equidigital number, since it uses as much as digits as its factorization.

561773609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 238140, while the sum is 44.

The square root of 561773609 is about 23701.7638373181. The cubic root of 561773609 is about 825.1263272730.

The spelling of 561773609 in words is "five hundred sixty-one million, seven hundred seventy-three thousand, six hundred nine".