255531191 has 2 divisors, whose sum is σ = 255531192. Its totient is φ = 255531190.

The previous prime is 255531163. The next prime is 255531259. The reversal of 255531191 is 191135552.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 255531191 - 2¹⁰ = 255530167 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (255531121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 127765595 + 127765596.

It is an arithmetic number, because the mean of its divisors is an integer number (127765596).

Almost surely, 2^255531191 is an apocalyptic number.

255531191 is a deficient number, since it is larger than the sum of its proper divisors (1).

255531191 is an equidigital number, since it uses as much as digits as its factorization.

255531191 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6750, while the sum is 32.

The square root of 255531191 is about 15985.3430053909. The cubic root of 255531191 is about 634.5725860811.

The spelling of 255531191 in words is "two hundred fifty-five million, five hundred thirty-one thousand, one hundred ninety-one".