111111101111 has 4 divisors (see below), whose sum is σ = 111792764472. Its totient is φ = 110429437752.

The previous prime is 111111101089. The next prime is 111111101119. The reversal of 111111101111 is 111101111111.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 111101111111 = 18917 ⋅5873083.

It is a cyclic number.

It is not a de Polignac number, because 111111101111 - 2³⁰ = 110037359287 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 111111101092 and 111111101101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111111101119) 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, 340831436 + ... + 340831761.

It is an arithmetic number, because the mean of its divisors is an integer number (27948191118).

Almost surely, 2^111111101111 is an apocalyptic number.

111111101111 is a deficient number, since it is larger than the sum of its proper divisors (681663361).

111111101111 is an equidigital number, since it uses as much as digits as its factorization.

111111101111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 681663360.

The product of its (nonzero) digits is 1, while the sum is 11.

Adding to 111111101111 its reverse (111101111111), we get a palindrome (222212212222).

It can be divided in two parts, 111 and 111101111, that multiplied together give a palindrome (12332223321).

The spelling of 111111101111 in words is "one hundred eleven billion, one hundred eleven million, one hundred one thousand, one hundred eleven".