561889 has 4 divisors (see below), whose sum is σ = 564480. Its totient is φ = 559300.

The previous prime is 561839. The next prime is 561907. The reversal of 561889 is 988165.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 561889 - 2⁷ = 561761 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (561809) 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, 937 + ... + 1414.

It is an arithmetic number, because the mean of its divisors is an integer number (141120).

2⁵⁶¹⁸⁸⁹ is an apocalyptic number.

It is an amenable number.

561889 is a deficient number, since it is larger than the sum of its proper divisors (2591).

561889 is a wasteful number, since it uses less digits than its factorization.

561889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2590.

The product of its digits is 17280, while the sum is 37.

The square root of 561889 is about 749.5925559929. The cubic root of 561889 is about 82.5182818377.

The spelling of 561889 in words is "five hundred sixty-one thousand, eight hundred eighty-nine".