255806171 has 2 divisors, whose sum is σ = 255806172. Its totient is φ = 255806170.

The previous prime is 255806167. The next prime is 255806209. The reversal of 255806171 is 171608552.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 255806171 - 2² = 255806167 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (255802171) 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, 127903085 + 127903086.

It is an arithmetic number, because the mean of its divisors is an integer number (127903086).

Almost surely, 2^255806171 is an apocalyptic number.

255806171 is a deficient number, since it is larger than the sum of its proper divisors (1).

255806171 is an equidigital number, since it uses as much as digits as its factorization.

255806171 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16800, while the sum is 35.

The square root of 255806171 is about 15993.9416967801. The cubic root of 255806171 is about 634.8001280555.

The spelling of 255806171 in words is "two hundred fifty-five million, eight hundred six thousand, one hundred seventy-one".