561623 has 8 divisors (see below), whose sum is σ = 591888. Its totient is φ = 532224.

The previous prime is 561607. The next prime is 561667. The reversal of 561623 is 326165.

561623 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 561623 - 2⁴ = 561607 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561923) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1415 + ... + 1767.

It is an arithmetic number, because the mean of its divisors is an integer number (73986).

2⁵⁶¹⁶²³ is an apocalyptic number.

561623 is a deficient number, since it is larger than the sum of its proper divisors (30265).

561623 is a wasteful number, since it uses less digits than its factorization.

561623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 433.

The product of its digits is 1080, while the sum is 23.

The square root of 561623 is about 749.4151052654. The cubic root of 561623 is about 82.5052583119.

Adding to 561623 its reverse (326165), we get a palindrome (887788).

It can be divided in two parts, 56162 and 3, that added together give a palindrome (56165).

The spelling of 561623 in words is "five hundred sixty-one thousand, six hundred twenty-three".