111011111111 has 2 divisors, whose sum is σ = 111011111112. Its totient is φ = 111011111110.

The previous prime is 111011111087. The next prime is 111011111119. The reversal of 111011111111 is 111111110111.

It is a strong prime.

It is an emirp because it is prime and its reverse (111111110111) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 111011111111 - 2⁶ = 111011111047 is a prime.

111011111111 is a modest number, since divided by 111111 gives 111011 as remainder.

It is a junction number, because it is equal to n+sod(n) for n = 111011111092 and 111011111101.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111011111119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55505555555 + 55505555556.

It is an arithmetic number, because the mean of its divisors is an integer number (55505555556).

Almost surely, 2^111011111111 is an apocalyptic number.

111011111111 is a deficient number, since it is larger than the sum of its proper divisors (1).

111011111111 is an equidigital number, since it uses as much as digits as its factorization.

111011111111 is an evil number, because the sum of its binary digits is even.

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

Adding to 111011111111 its reverse (111111110111), we get a palindrome (222122221222).

It can be divided in two parts, 1110111 and 11111, that multiplied together give a palindrome (12334443321).

The spelling of 111011111111 in words is "one hundred eleven billion, eleven million, one hundred eleven thousand, one hundred eleven".