111011111111001 has 4 divisors (see below), whose sum is σ = 148014814814672. Its totient is φ = 74007407407332.

The previous prime is 111011111110997. The next prime is 111011111111027. The reversal of 111011111111001 is 100111111110111.

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 not a de Polignac number, because 111011111111001 - 2² = 111011111110997 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (111011111111051) 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, 18501851851831 + ... + 18501851851836.

It is an arithmetic number, because the mean of its divisors is an integer number (37003703703668).

Almost surely, 2^{111011111111001} is an apocalyptic number.

It is an amenable number.

111011111111001 is a deficient number, since it is larger than the sum of its proper divisors (37003703703671).

111011111111001 is an equidigital number, since it uses as much as digits as its factorization.

111011111111001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37003703703670.

The product of its (nonzero) digits is 1, while the sum is 12.

Adding to 111011111111001 its reverse (100111111110111), we get a palindrome (211122222221112).

The spelling of 111011111111001 in words is "one hundred eleven trillion, eleven billion, one hundred eleven million, one hundred eleven thousand, one".