259861 has 4 divisors (see below), whose sum is σ = 296992. Its totient is φ = 222732.

The previous prime is 259841. The next prime is 259867. The reversal of 259861 is 168952.

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 259861 - 2⁵ = 259829 is a prime.

It is a Duffinian number.

259861 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (259867) 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, 18555 + ... + 18568.

It is an arithmetic number, because the mean of its divisors is an integer number (74248).

2²⁵⁹⁸⁶¹ is an apocalyptic number.

It is an amenable number.

259861 is a deficient number, since it is larger than the sum of its proper divisors (37131).

259861 is an equidigital number, since it uses as much as digits as its factorization.

259861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37130.

The product of its digits is 4320, while the sum is 31.

The square root of 259861 is about 509.7656324234. The cubic root of 259861 is about 63.8136670111.

Subtracting from 259861 its reverse (168952), we obtain a palindrome (90909).

The spelling of 259861 in words is "two hundred fifty-nine thousand, eight hundred sixty-one".