111899 has 4 divisors (see below), whose sum is σ = 112800. Its totient is φ = 111000.

The previous prime is 111893. The next prime is 111913. The reversal of 111899 is 998111.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-111899 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 (111893) 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, 227 + ... + 524.

It is an arithmetic number, because the mean of its divisors is an integer number (28200).

2¹¹¹⁸⁹⁹ is an apocalyptic number.

111899 is a deficient number, since it is larger than the sum of its proper divisors (901).

111899 is an equidigital number, since it uses as much as digits as its factorization.

111899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 900.

The product of its digits is 648, while the sum is 29.

The square root of 111899 is about 334.5130789670. The cubic root of 111899 is about 48.1883513801.

The spelling of 111899 in words is "one hundred eleven thousand, eight hundred ninety-nine".