111111111100001 has 4 divisors (see below), whose sum is σ = 113695090427952. Its totient is φ = 108527131772052.

The previous prime is 111111111099913. The next prime is 111111111100021. The reversal of 111111111100001 is 100001111111111.

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 cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-111111111100001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (111111111100021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1291989663911 + ... + 1291989663996.

It is an arithmetic number, because the mean of its divisors is an integer number (28423772606988).

Almost surely, 2^{111111111100001} is an apocalyptic number.

It is an amenable number.

111111111100001 is a deficient number, since it is larger than the sum of its proper divisors (2583979327951).

111111111100001 is an equidigital number, since it uses as much as digits as its factorization.

111111111100001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2583979327950.

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

Adding to 111111111100001 its reverse (100001111111111), we get a palindrome (211112222211112).

It can be divided in two parts, 111111111 and 100001, that multiplied together give a palindrome (11111222211111).

The spelling of 111111111100001 in words is "one hundred eleven trillion, one hundred eleven billion, one hundred eleven million, one hundred thousand, one".