255491 has 4 divisors (see below), whose sum is σ = 256800. Its totient is φ = 254184.

The previous prime is 255487. The next prime is 255499. The reversal of 255491 is 194552.

255491 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 255491 - 2² = 255487 is a prime.

It is a Duffinian number.

It is a zygodrome in base 2.

It is a self number, because there is not a number n which added to its sum of digits gives 255491.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 255491.

It is not an unprimeable number, because it can be changed into a prime (255499) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 296 + ... + 773.

It is an arithmetic number, because the mean of its divisors is an integer number (64200).

2²⁵⁵⁴⁹¹ is an apocalyptic number.

255491 is a deficient number, since it is larger than the sum of its proper divisors (1309).

255491 is a wasteful number, since it uses less digits than its factorization.

255491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1308.

The product of its digits is 1800, while the sum is 26.

The square root of 255491 is about 505.4611755615. The cubic root of 255491 is about 63.4539314939.

The spelling of 255491 in words is "two hundred fifty-five thousand, four hundred ninety-one".