111111101101111 has 4 divisors (see below), whose sum is σ = 111130777235872. Its totient is φ = 111091424966352.

The previous prime is 111111101101069. The next prime is 111111101101129. The reversal of 111111101101111 is 111101101111111.

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 111111101101111 - 2¹⁹ = 111111100576823 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 111111101101091 and 111111101101100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111111104101111) 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, 9838058910 + ... + 9838070203.

It is an arithmetic number, because the mean of its divisors is an integer number (27782694308968).

Almost surely, 2^{111111101101111} is an apocalyptic number.

111111101101111 is a deficient number, since it is larger than the sum of its proper divisors (19676134761).

111111101101111 is an equidigital number, since it uses as much as digits as its factorization.

111111101101111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19676134760.

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

Adding to 111111101101111 its reverse (111101101111111), we get a palindrome (222212202212222).

It can be divided in two parts, 111 and 111101101111, that multiplied together give a palindrome (12332222223321).

The spelling of 111111101101111 in words is "one hundred eleven trillion, one hundred eleven billion, one hundred one million, one hundred one thousand, one hundred eleven".