561563 has 4 divisors (see below), whose sum is σ = 565800. Its totient is φ = 557328.

The previous prime is 561559. The next prime is 561599. The reversal of 561563 is 365165.

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

It is a cyclic number.

It is not a de Polignac number, because 561563 - 2² = 561559 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (561553) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1913 + ... + 2186.

It is an arithmetic number, because the mean of its divisors is an integer number (141450).

2⁵⁶¹⁵⁶³ is an apocalyptic number.

561563 is a deficient number, since it is larger than the sum of its proper divisors (4237).

561563 is a wasteful number, since it uses less digits than its factorization.

561563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4236.

The product of its digits is 2700, while the sum is 26.

The square root of 561563 is about 749.3750729775. The cubic root of 561563 is about 82.5023201062.

The spelling of 561563 in words is "five hundred sixty-one thousand, five hundred sixty-three".