561255605 has 4 divisors (see below), whose sum is σ = 673506732. Its totient is φ = 449004480.

The previous prime is 561255587. The next prime is 561255641. The reversal of 561255605 is 506552165.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 424318801 + 136936804 = 20599^2 + 11702^2 .

It is not a de Polignac number, because 561255605 - 2⁸ = 561255349 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 56125556 + ... + 56125565.

It is an arithmetic number, because the mean of its divisors is an integer number (168376683).

Almost surely, 2^561255605 is an apocalyptic number.

It is an amenable number.

561255605 is a deficient number, since it is larger than the sum of its proper divisors (112251127).

561255605 is a wasteful number, since it uses less digits than its factorization.

561255605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112251126.

The product of its (nonzero) digits is 45000, while the sum is 35.

The square root of 561255605 is about 23690.8337759565. The cubic root of 561255605 is about 824.8726365982.

The spelling of 561255605 in words is "five hundred sixty-one million, two hundred fifty-five thousand, six hundred five".