255791 has 4 divisors (see below), whose sum is σ = 257400. Its totient is φ = 254184.

The previous prime is 255767. The next prime is 255803. The reversal of 255791 is 197552.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-255791 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 (255191) 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, 536 + ... + 893.

It is an arithmetic number, because the mean of its divisors is an integer number (64350).

2²⁵⁵⁷⁹¹ is an apocalyptic number.

255791 is a deficient number, since it is larger than the sum of its proper divisors (1609).

255791 is a wasteful number, since it uses less digits than its factorization.

255791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1608.

The product of its digits is 3150, while the sum is 29.

The square root of 255791 is about 505.7578471957. The cubic root of 255791 is about 63.4787578524.

The spelling of 255791 in words is "two hundred fifty-five thousand, seven hundred ninety-one".