561789 has 8 divisors (see below), whose sum is σ = 832320. Its totient is φ = 374508.

The previous prime is 561787. The next prime is 561797. The reversal of 561789 is 987165.

561789 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 561789 - 2¹ = 561787 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561787) 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, 10377 + ... + 10430.

It is an arithmetic number, because the mean of its divisors is an integer number (104040).

2⁵⁶¹⁷⁸⁹ is an apocalyptic number.

It is an amenable number.

561789 is a deficient number, since it is larger than the sum of its proper divisors (270531).

561789 is a wasteful number, since it uses less digits than its factorization.

561789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20816 (or 20810 counting only the distinct ones).

The product of its digits is 15120, while the sum is 36.

The square root of 561789 is about 749.5258501213. The cubic root of 561789 is about 82.5133862576.

The spelling of 561789 in words is "five hundred sixty-one thousand, seven hundred eighty-nine".