561859 has 4 divisors (see below), whose sum is σ = 566280. Its totient is φ = 557440.

The previous prime is 561839. The next prime is 561907. The reversal of 561859 is 958165.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 561859 - 2⁹ = 561347 is a prime.

It is a Duffinian number.

561859 is a lucky 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, 2014 + ... + 2275.

It is an arithmetic number, because the mean of its divisors is an integer number (141570).

2⁵⁶¹⁸⁵⁹ is an apocalyptic number.

561859 is a deficient number, since it is larger than the sum of its proper divisors (4421).

561859 is a wasteful number, since it uses less digits than its factorization.

561859 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4420.

The product of its digits is 10800, while the sum is 34.

The square root of 561859 is about 749.5725448547. The cubic root of 561859 is about 82.5168132247.

The spelling of 561859 in words is "five hundred sixty-one thousand, eight hundred fifty-nine".