259891 has 4 divisors (see below), whose sum is σ = 261072. Its totient is φ = 258712.

The previous prime is 259867. The next prime is 259907. The reversal of 259891 is 198952.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 259891 - 2⁹ = 259379 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (259801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 151 + ... + 736.

It is an arithmetic number, because the mean of its divisors is an integer number (65268).

2²⁵⁹⁸⁹¹ is an apocalyptic number.

259891 is a deficient number, since it is larger than the sum of its proper divisors (1181).

259891 is an equidigital number, since it uses as much as digits as its factorization.

259891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1180.

The product of its digits is 6480, while the sum is 34.

The square root of 259891 is about 509.7950568611. The cubic root of 259891 is about 63.8161226013.

The spelling of 259891 in words is "two hundred fifty-nine thousand, eight hundred ninety-one".