111101111011111 has 4 divisors (see below), whose sum is σ = 119647350319672. Its totient is φ = 102554871702552.

The previous prime is 111101111011003. The next prime is 111101111011117. The reversal of 111101111011111 is 111110111101111.

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 111101111011111 - 2¹⁹ = 111101110486823 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13), and also a Moran number because the ratio is a prime number: 8546239308547 = 111101111011111 / (1 + 1 + 1 + 1 + 0 + 1 + 1 + 1 + 1 + 0 + 1 + 1 + 1 + 1 + 1).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 111101111011091 and 111101111011100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111101111011117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4273119654261 + ... + 4273119654286.

It is an arithmetic number, because the mean of its divisors is an integer number (29911837579918).

Almost surely, 2^{111101111011111} is an apocalyptic number.

111101111011111 is a deficient number, since it is larger than the sum of its proper divisors (8546239308561).

111101111011111 is an equidigital number, since it uses as much as digits as its factorization.

111101111011111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8546239308560.

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

Adding to 111101111011111 its reverse (111110111101111), we get a palindrome (222211222112222).

The spelling of 111101111011111 in words is "one hundred eleven trillion, one hundred one billion, one hundred eleven million, eleven thousand, one hundred eleven".