255191 has 2 divisors, whose sum is σ = 255192. Its totient is φ = 255190.

The previous prime is 255181. The next prime is 255193. The reversal of 255191 is 191552.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 255191 - 2⁶ = 255127 is a prime.

It is a Sophie Germain prime.

Together with 255193, it forms a pair of twin primes.

It is a Chen prime.

It is a plaindrome in base 14.

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 255191.

It is not a weakly prime, because it can be changed into another prime (255193) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 127595 + 127596.

It is an arithmetic number, because the mean of its divisors is an integer number (127596).

2²⁵⁵¹⁹¹ is an apocalyptic number.

255191 is a deficient number, since it is larger than the sum of its proper divisors (1).

255191 is an equidigital number, since it uses as much as digits as its factorization.

255191 is an evil number, because the sum of its binary digits is even.

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

The square root of 255191 is about 505.1643296988. The cubic root of 255191 is about 63.4290856935.

The spelling of 255191 in words is "two hundred fifty-five thousand, one hundred ninety-one".