218255 has 4 divisors (see below), whose sum is σ = 261912. Its totient is φ = 174600.

The previous prime is 218249. The next prime is 218279. The reversal of 218255 is 552812.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 218255 - 2⁶ = 218191 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 218255.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21821 + ... + 21830.

It is an arithmetic number, because the mean of its divisors is an integer number (65478).

2²¹⁸²⁵⁵ is an apocalyptic number.

218255 is a deficient number, since it is larger than the sum of its proper divisors (43657).

218255 is an equidigital number, since it uses as much as digits as its factorization.

218255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43656.

The product of its digits is 800, while the sum is 23.

The square root of 218255 is about 467.1776963854. The cubic root of 218255 is about 60.2080738832.

The spelling of 218255 in words is "two hundred eighteen thousand, two hundred fifty-five".