561489 has 4 divisors (see below), whose sum is σ = 748656. Its totient is φ = 374324.

The previous prime is 561461. The next prime is 561521. The reversal of 561489 is 984165.

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 561489 - 2⁹ = 560977 is a prime.

It is a D-number.

It is not an unprimeable number, because it can be changed into a prime (561409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 93579 + ... + 93584.

It is an arithmetic number, because the mean of its divisors is an integer number (187164).

2⁵⁶¹⁴⁸⁹ is an apocalyptic number.

It is an amenable number.

561489 is a deficient number, since it is larger than the sum of its proper divisors (187167).

561489 is a wasteful number, since it uses less digits than its factorization.

561489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 187166.

The product of its digits is 8640, while the sum is 33.

The square root of 561489 is about 749.3256968769. The cubic root of 561489 is about 82.4986960308.

The spelling of 561489 in words is "five hundred sixty-one thousand, four hundred eighty-nine".