559661 has 4 divisors (see below), whose sum is σ = 561792. Its totient is φ = 557532.

The previous prime is 559649. The next prime is 559667. The reversal of 559661 is 166955.

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, and also an emirpimes, since its reverse is a distinct semiprime: 166955 = 5 ⋅33391.

It is a cyclic number.

It is not a de Polignac number, because 559661 - 2⁶ = 559597 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (559667) 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, 605 + ... + 1218.

It is an arithmetic number, because the mean of its divisors is an integer number (140448).

2⁵⁵⁹⁶⁶¹ is an apocalyptic number.

It is an amenable number.

559661 is a deficient number, since it is larger than the sum of its proper divisors (2131).

559661 is a wasteful number, since it uses less digits than its factorization.

559661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2130.

The product of its digits is 8100, while the sum is 32.

The square root of 559661 is about 748.1049391629. The cubic root of 559661 is about 82.4090703089.

The spelling of 559661 in words is "five hundred fifty-nine thousand, six hundred sixty-one".