218111 has 2 divisors, whose sum is σ = 218112. Its totient is φ = 218110.

The previous prime is 218107. The next prime is 218117. The reversal of 218111 is 111812.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 218111 - 2² = 218107 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (218117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109055 + 109056.

It is an arithmetic number, because the mean of its divisors is an integer number (109056).

2²¹⁸¹¹¹ is an apocalyptic number.

218111 is a deficient number, since it is larger than the sum of its proper divisors (1).

218111 is an equidigital number, since it uses as much as digits as its factorization.

218111 is an evil number, because the sum of its binary digits is even.

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

The square root of 218111 is about 467.0235540099. The cubic root of 218111 is about 60.1948296351.

Adding to 218111 its reverse (111812), we get a palindrome (329923).

It can be divided in two parts, 21811 and 1, that added together give a palindrome (21812).

The spelling of 218111 in words is "two hundred eighteen thousand, one hundred eleven".