255217 has 2 divisors, whose sum is σ = 255218. Its totient is φ = 255216.

The previous prime is 255209. The next prime is 255239. The reversal of 255217 is 712552.

It is an a-pointer prime, because the next prime (255239) can be obtained adding 255217 to its sum of digits (22).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 197136 + 58081 = 444^2 + 241^2 .

It is a cyclic number.

It is not a de Polignac number, because 255217 - 2³ = 255209 is a prime.

It is not a weakly prime, because it can be changed into another prime (255247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 127608 + 127609.

It is an arithmetic number, because the mean of its divisors is an integer number (127609).

2²⁵⁵²¹⁷ is an apocalyptic number.

It is an amenable number.

255217 is a deficient number, since it is larger than the sum of its proper divisors (1).

255217 is an equidigital number, since it uses as much as digits as its factorization.

255217 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 700, while the sum is 22.

The square root of 255217 is about 505.1900632435. The cubic root of 255217 is about 63.4312397666.

Adding to 255217 its reverse (712552), we get a palindrome (967769).

The spelling of 255217 in words is "two hundred fifty-five thousand, two hundred seventeen".