111111899 has 4 divisors (see below), whose sum is σ = 111137664. Its totient is φ = 111086136.

The previous prime is 111111853. The next prime is 111111941. The reversal of 111111899 is 998111111.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-111111899 is a prime.

It is a Duffinian number.

It is a plaindrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (111111199) 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, 4667 + ... + 15620.

It is an arithmetic number, because the mean of its divisors is an integer number (27784416).

Almost surely, 2^111111899 is an apocalyptic number.

111111899 is a deficient number, since it is larger than the sum of its proper divisors (25765).

111111899 is an equidigital number, since it uses as much as digits as its factorization.

111111899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25764.

The product of its digits is 648, while the sum is 32.

The square root of 111111899 is about 10540.9629066798. The cubic root of 111111899 is about 480.7509930989.

The spelling of 111111899 in words is "one hundred eleven million, one hundred eleven thousand, eight hundred ninety-nine".