255969 has 24 divisors (see below), whose sum is σ = 449280. Its totient is φ = 137088.

The previous prime is 255961. The next prime is 255971. The reversal of 255969 is 969552.

It is not a de Polignac number, because 255969 - 2³ = 255961 is a prime.

It is a super-2 number, since 2×255969² = 131040257922, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (255961) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 952 + ... + 1190.

It is an arithmetic number, because the mean of its divisors is an integer number (18720).

2²⁵⁵⁹⁶⁹ is an apocalyptic number.

It is an amenable number.

255969 is a deficient number, since it is larger than the sum of its proper divisors (193311).

255969 is a wasteful number, since it uses less digits than its factorization.

255969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 269 (or 266 counting only the distinct ones).

The product of its digits is 24300, while the sum is 36.

The square root of 255969 is about 505.9337901346. The cubic root of 255969 is about 63.4934789840.

It can be divided in two parts, 2559 and 69, that added together give a triangular number (2628 = T₇₂).

The spelling of 255969 in words is "two hundred fifty-five thousand, nine hundred sixty-nine".