1111100111111 has 2 divisors, whose sum is σ = 1111100111112. Its totient is φ = 1111100111110.

The previous prime is 1111100111101. The next prime is 1111100111113. The reversal of 1111100111111 is 1111110011111.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1111100111111 - 2¹⁸ = 1111099848967 is a prime.

Together with 1111100111113, it forms a pair of twin primes.

It is a Chen prime.

It is a zygodrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 1111100111092 and 1111100111101.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1111100111113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 555550055555 + 555550055556.

It is an arithmetic number, because the mean of its divisors is an integer number (555550055556).

Almost surely, 2^{1111100111111} is an apocalyptic number.

1111100111111 is a deficient number, since it is larger than the sum of its proper divisors (1).

1111100111111 is an equidigital number, since it uses as much as digits as its factorization.

1111100111111 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 1111100111111 its reverse (1111110011111), we get a palindrome (2222210122222).

The spelling of 1111100111111 in words is "one trillion, one hundred eleven billion, one hundred million, one hundred eleven thousand, one hundred eleven".