111111001111111 has 4 divisors (see below), whose sum is σ = 111114617212432. Its totient is φ = 111107385009792.

The previous prime is 111111001111051. The next prime is 111111001111133. The reversal of 111111001111111 is 111111100111111.

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 111111001111111 - 2¹⁹ = 111111000586823 is a prime.

It is a Duffinian number.

It is a zygodrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 111111001111091 and 111111001111100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111111001111141) 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, 1808004570 + ... + 1808066023.

It is an arithmetic number, because the mean of its divisors is an integer number (27778654303108).

Almost surely, 2^{111111001111111} is an apocalyptic number.

111111001111111 is a deficient number, since it is larger than the sum of its proper divisors (3616101321).

111111001111111 is an equidigital number, since it uses as much as digits as its factorization.

111111001111111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3616101320.

The product of its (nonzero) digits is 1, while the sum is 13.

Adding to 111111001111111 its reverse (111111100111111), we get a palindrome (222222101222222).

The spelling of 111111001111111 in words is "one hundred eleven trillion, one hundred eleven billion, one million, one hundred eleven thousand, one hundred eleven".