111111111001111 has 16 divisors (see below), whose sum is σ = 122298258386304. Its totient is φ = 100304491359744.

The previous prime is 111111111001091. The next prime is 111111111001129. The reversal of 111111111001111 is 111100111111111.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 111111111001111 - 2⁹ = 111111111000599 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a zygodrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 111111111001091 and 111111111001100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111111111601111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 69312100 + ... + 70897033.

It is an arithmetic number, because the mean of its divisors is an integer number (7643641149144).

Almost surely, 2^{111111111001111} is an apocalyptic number.

111111111001111 is a deficient number, since it is larger than the sum of its proper divisors (11187147385193).

111111111001111 is a wasteful number, since it uses less digits than its factorization.

111111111001111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140210490.

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

Adding to 111111111001111 its reverse (111100111111111), we get a palindrome (222211222112222).

It can be divided in two parts, 11111 and 1111001111, that multiplied together give a palindrome (12344333344321).

The spelling of 111111111001111 in words is "one hundred eleven trillion, one hundred eleven billion, one hundred eleven million, one thousand, one hundred eleven".