111111001100001 has 36 divisors (see below), whose sum is σ = 190466324780992. Its totient is φ = 63492000602328.

The previous prime is 111111001099999. The next prime is 111111001100063. The reversal of 111111001100001 is 100001100111111.

It is not a de Polignac number, because 111111001100001 - 2¹ = 111111001099999 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 (111111001100101) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 1209602005 + ... + 1209693858.

Almost surely, 2^{111111001100001} is an apocalyptic number.

It is an amenable number.

111111001100001 is a deficient number, since it is larger than the sum of its proper divisors (79355323680991).

111111001100001 is an frugal number, since it uses more digits than its factorization.

111111001100001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2419295894 (or 2419295873 counting only the distinct ones).

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

Adding to 111111001100001 its reverse (100001100111111), we get a palindrome (211112101211112).

The spelling of 111111001100001 in words is "one hundred eleven trillion, one hundred eleven billion, one million, one hundred thousand, one".