561256055 has 4 divisors (see below), whose sum is σ = 673507272. Its totient is φ = 449004840.

The previous prime is 561256049. The next prime is 561256063. The reversal of 561256055 is 550652165.

561256055 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 561256055 - 2¹⁴ = 561239671 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 56125601 + ... + 56125610.

It is an arithmetic number, because the mean of its divisors is an integer number (168376818).

Almost surely, 2^561256055 is an apocalyptic number.

561256055 is a deficient number, since it is larger than the sum of its proper divisors (112251217).

561256055 is a wasteful number, since it uses less digits than its factorization.

561256055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112251216.

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

The square root of 561256055 is about 23690.8432732987. The cubic root of 561256055 is about 824.8728570519.

The spelling of 561256055 in words is "five hundred sixty-one million, two hundred fifty-six thousand, fifty-five".