111218 has 4 divisors (see below), whose sum is σ = 166830. Its totient is φ = 55608.

The previous prime is 111217. The next prime is 111227. The reversal of 111218 is 812111.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 812111 = 269 ⋅3019.

It can be written as a sum of positive squares in only one way, i.e., 104329 + 6889 = 323^2 + 83^2 .

It is a Curzon number.

It is a nialpdrome in base 12.

It is not an unprimeable number, because it can be changed into a prime (111211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27803 + ... + 27806.

2¹¹¹²¹⁸ is an apocalyptic number.

111218 is a deficient number, since it is larger than the sum of its proper divisors (55612).

111218 is an equidigital number, since it uses as much as digits as its factorization.

111218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55611.

The product of its digits is 16, while the sum is 14.

The square root of 111218 is about 333.4936281250. The cubic root of 111218 is about 48.0903967815.

Adding to 111218 its reverse (812111), we get a palindrome (923329).

The spelling of 111218 in words is "one hundred eleven thousand, two hundred eighteen".