255565171 has 2 divisors, whose sum is σ = 255565172. Its totient is φ = 255565170.

The previous prime is 255565157. The next prime is 255565229. The reversal of 255565171 is 171565552.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 255565171 - 2¹⁹ = 255040883 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 255565171.

It is not a weakly prime, because it can be changed into another prime (255565111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 127782585 + 127782586.

It is an arithmetic number, because the mean of its divisors is an integer number (127782586).

Almost surely, 2^255565171 is an apocalyptic number.

255565171 is a deficient number, since it is larger than the sum of its proper divisors (1).

255565171 is an equidigital number, since it uses as much as digits as its factorization.

255565171 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 52500, while the sum is 37.

The square root of 255565171 is about 15986.4058186948. The cubic root of 255565171 is about 634.6007128767.

The spelling of 255565171 in words is "two hundred fifty-five million, five hundred sixty-five thousand, one hundred seventy-one".