111823 has 4 divisors (see below), whose sum is σ = 113560. Its totient is φ = 110088.

The previous prime is 111821. The next prime is 111827. The reversal of 111823 is 328111.

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

It is a cyclic number.

It is not a de Polignac number, because 111823 - 2¹ = 111821 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 111797 and 111806.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 768 + ... + 901.

It is an arithmetic number, because the mean of its divisors is an integer number (28390).

2¹¹¹⁸²³ is an apocalyptic number.

111823 is a deficient number, since it is larger than the sum of its proper divisors (1737).

111823 is an equidigital number, since it uses as much as digits as its factorization.

111823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1736.

The product of its digits is 48, while the sum is 16.

The square root of 111823 is about 334.3994617221. The cubic root of 111823 is about 48.1774393250.

Adding to 111823 its reverse (328111), we get a palindrome (439934).

The spelling of 111823 in words is "one hundred eleven thousand, eight hundred twenty-three".