111818 has 16 divisors (see below), whose sum is σ = 196800. Its totient is φ = 47628.

The previous prime is 111799. The next prime is 111821. The reversal of 111818 is 818111.

It is a Curzon number.

It is a nialpdrome in base 7.

It is a self number, because there is not a number n which added to its sum of digits gives 111818.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 605 + ... + 767.

It is an arithmetic number, because the mean of its divisors is an integer number (12300).

2¹¹¹⁸¹⁸ is an apocalyptic number.

111818 is a deficient number, since it is larger than the sum of its proper divisors (84982).

111818 is an equidigital number, since it uses as much as digits as its factorization.

111818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 186 (or 172 counting only the distinct ones).

The product of its digits is 64, while the sum is 20.

The square root of 111818 is about 334.3919855499. The cubic root of 111818 is about 48.1767212533.

Adding to 111818 its reverse (818111), we get a palindrome (929929).

It can be divided in two parts, 111 and 818, that added together give a palindrome (929).

The spelling of 111818 in words is "one hundred eleven thousand, eight hundred eighteen".