111100111001001 has 8 divisors (see below), whose sum is σ = 164592757038560. Its totient is φ = 74066740667316.

The previous prime is 111100111000999. The next prime is 111100111001003. The reversal of 111100111001001 is 100100111001111.

It is an interprime number because it is at equal distance from previous prime (111100111000999) and next prime (111100111001003).

It is not a de Polignac number, because 111100111001001 - 2¹ = 111100111000999 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (111100111001003) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2057409462955 + ... + 2057409463008.

It is an arithmetic number, because the mean of its divisors is an integer number (20574094629820).

Almost surely, 2^{111100111001001} is an apocalyptic number.

It is an amenable number.

111100111001001 is a deficient number, since it is larger than the sum of its proper divisors (53492646037559).

111100111001001 is an equidigital number, since it uses as much as digits as its factorization.

111100111001001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4114818925972 (or 4114818925966 counting only the distinct ones).

The product of its (nonzero) digits is 1, while the sum is 9.

Adding to 111100111001001 its reverse (100100111001111), we get a palindrome (211200222002112).

The spelling of 111100111001001 in words is "one hundred eleven trillion, one hundred billion, one hundred eleven million, one thousand, one".