218225 has 24 divisors (see below), whose sum is σ = 327360. Its totient is φ = 141120.

The previous prime is 218213. The next prime is 218227. The reversal of 218225 is 522812.

218225 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 218225 - 2⁸ = 217969 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 218197 and 218206.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 218225.

It is not an unprimeable number, because it can be changed into a prime (218227) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5054 + ... + 5096.

It is an arithmetic number, because the mean of its divisors is an integer number (13640).

2²¹⁸²²⁵ is an apocalyptic number.

218225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

218225 is a deficient number, since it is larger than the sum of its proper divisors (109135).

218225 is a wasteful number, since it uses less digits than its factorization.

218225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89 (or 84 counting only the distinct ones).

The product of its digits is 320, while the sum is 20.

The square root of 218225 is about 467.1455875849. The cubic root of 218225 is about 60.2053151453.

The spelling of 218225 in words is "two hundred eighteen thousand, two hundred twenty-five".