111111100111 has 4 divisors (see below), whose sum is σ = 121212109224. Its totient is φ = 101010091000.

The previous prime is 111111100109. The next prime is 111111100157. The reversal of 111111100111 is 111001111111.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 111111100111 - 2¹ = 111111100109 is a prime.

It is a Duffinian number.

It is a zygodrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111111100181) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5050504540 + ... + 5050504561.

It is an arithmetic number, because the mean of its divisors is an integer number (30303027306).

Almost surely, 2^111111100111 is an apocalyptic number.

111111100111 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

111111100111 is a deficient number, since it is larger than the sum of its proper divisors (10101009113).

111111100111 is a wasteful number, since it uses less digits than its factorization.

111111100111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10101009112.

The product of its (nonzero) digits is 1, while the sum is 10.

Adding to 111111100111 its reverse (111001111111), we get a palindrome (222112211222).

It can be divided in two parts, 1111 and 11100111, that multiplied together give a palindrome (12332223321).

The spelling of 111111100111 in words is "one hundred eleven billion, one hundred eleven million, one hundred thousand, one hundred eleven".