259591 has 4 divisors (see below), whose sum is σ = 265672. Its totient is φ = 253512.

The previous prime is 259583. The next prime is 259603. The reversal of 259591 is 195952.

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 259591 - 2³ = 259583 is a prime.

It is the 510-th Hogben number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (259531) by changing a digit.

It is a nontrivial repunit in base 509.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2976 + ... + 3061.

It is an arithmetic number, because the mean of its divisors is an integer number (66418).

2²⁵⁹⁵⁹¹ is an apocalyptic number.

259591 is a deficient number, since it is larger than the sum of its proper divisors (6081).

259591 is an equidigital number, since it uses as much as digits as its factorization.

259591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6080.

The product of its digits is 4050, while the sum is 31.

The square root of 259591 is about 509.5007360152. The cubic root of 259591 is about 63.7915581903.

Subtracting from 259591 its sum of digits (31), we obtain a triangular number (259560 = T₇₂₀).

The spelling of 259591 in words is "two hundred fifty-nine thousand, five hundred ninety-one".