255911 has 4 divisors (see below), whose sum is σ = 269400. Its totient is φ = 242424.

The previous prime is 255907. The next prime is 255917. The reversal of 255911 is 119552.

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 255911 - 2² = 255907 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (255917) 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, 6716 + ... + 6753.

It is an arithmetic number, because the mean of its divisors is an integer number (67350).

2²⁵⁵⁹¹¹ is an apocalyptic number.

255911 is a deficient number, since it is larger than the sum of its proper divisors (13489).

255911 is a wasteful number, since it uses less digits than its factorization.

255911 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13488.

The product of its digits is 450, while the sum is 23.

The square root of 255911 is about 505.8764671340. The cubic root of 255911 is about 63.4886829606.

The spelling of 255911 in words is "two hundred fifty-five thousand, nine hundred eleven".