111818111 has 16 divisors (see below), whose sum is σ = 120234240. Its totient is φ = 103730880.

The previous prime is 111818099. The next prime is 111818117.

111818111 is nontrivially palindromic in base 10.

It is a cyclic number.

It is not a de Polignac number, because 111818111 - 2¹⁸ = 111555967 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23).

111818111 is a strobogrammatic number because it is the same when read upside-down.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111818117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 266660 + ... + 267078.

It is an arithmetic number, because the mean of its divisors is an integer number (7514640).

Almost surely, 2^111818111 is an apocalyptic number.

111818111 is a deficient number, since it is larger than the sum of its proper divisors (8416129).

111818111 is a wasteful number, since it uses less digits than its factorization.

111818111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 766.

The product of its digits is 64, while the sum is 23.

The square root of 111818111 is about 10574.4083049597. The cubic root of 111818111 is about 481.7673719477.

The spelling of 111818111 in words is "one hundred eleven million, eight hundred eighteen thousand, one hundred eleven".