111111011110001 has 4 divisors (see below), whose sum is σ = 126984012697152. Its totient is φ = 95238009522852.

The previous prime is 111111011109899. The next prime is 111111011110049. The reversal of 111111011110001 is 100011110111111.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a de Polignac number, because none of the positive numbers 2^k-111111011110001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (111111011110091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7936500793565 + ... + 7936500793578.

It is an arithmetic number, because the mean of its divisors is an integer number (31746003174288).

Almost surely, 2^{111111011110001} is an apocalyptic number.

It is an amenable number.

111111011110001 is a deficient number, since it is larger than the sum of its proper divisors (15873001587151).

111111011110001 is an equidigital number, since it uses as much as digits as its factorization.

111111011110001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15873001587150.

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

Adding to 111111011110001 its reverse (100011110111111), we get a palindrome (211122121221112).

The spelling of 111111011110001 in words is "one hundred eleven trillion, one hundred eleven billion, eleven million, one hundred ten thousand, one".