111101111111 has 4 divisors (see below), whose sum is σ = 111107003112.
Its totient is φ = 111095219112.
The previous prime is 111101111071. The next prime is 111101111123. The reversal of 111101111111 is 111111101111.
It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 111111101111 = 163 ⋅681663197.
It is a cyclic number.
It is a de Polignac number, because none of the positive numbers 2k-111101111111 is a prime.
It is a Duffinian number.
111101111111 is a modest number, since divided by 111111 gives 111101 as remainder.
It is a junction number, because it is equal to n+sod(n) for n = 111101111092 and 111101111101.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (111101111161) 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, 2917625 + ... + 2955458.
It is an arithmetic number, because the mean of its divisors is an integer number (27776750778).
Almost surely, 2111101111111 is an apocalyptic number.
111101111111 is a deficient number, since it is larger than the sum of its proper divisors (5892001).
111101111111 is an equidigital number, since it uses as much as digits as its factorization.
111101111111 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 5892000.
The product of its (nonzero) digits is 1, while the sum is 11.
Adding to 111101111111 its reverse (111111101111), we get a palindrome (222212212222).
It can be divided in two parts, 111101111 and 111, that multiplied together give a palindrome (12332223321).
The spelling of 111101111111 in words is "one hundred eleven billion, one hundred one million, one hundred eleven thousand, one hundred eleven".