255605191 has 2 divisors, whose sum is σ = 255605192. Its totient is φ = 255605190.

The previous prime is 255605171. The next prime is 255605197. The reversal of 255605191 is 191506552.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 255605191 - 2¹⁷ = 255474119 is a prime.

It is a super-2 number, since 2×255605191² = 130668027332292962, which contains 22 as substring.

It is a zygodrome in base 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (255605197) 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, 127802595 + 127802596.

It is an arithmetic number, because the mean of its divisors is an integer number (127802596).

Almost surely, 2^255605191 is an apocalyptic number.

255605191 is a deficient number, since it is larger than the sum of its proper divisors (1).

255605191 is an equidigital number, since it uses as much as digits as its factorization.

255605191 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13500, while the sum is 34.

The square root of 255605191 is about 15987.6574581769. The cubic root of 255605191 is about 634.6338360587.

The spelling of 255605191 in words is "two hundred fifty-five million, six hundred five thousand, one hundred ninety-one".