111859 has 4 divisors (see below), whose sum is σ = 122040. Its totient is φ = 101680.

The previous prime is 111857. The next prime is 111863. The reversal of 111859 is 958111.

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 111859 - 2¹ = 111857 is a prime.

It is a Duffinian number.

111859 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111857) 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, 5074 + ... + 5095.

It is an arithmetic number, because the mean of its divisors is an integer number (30510).

2¹¹¹⁸⁵⁹ is an apocalyptic number.

111859 is a deficient number, since it is larger than the sum of its proper divisors (10181).

111859 is a wasteful number, since it uses less digits than its factorization.

111859 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10180.

The product of its digits is 360, while the sum is 25.

The square root of 111859 is about 334.4532852283. The cubic root of 111859 is about 48.1826088093.

It can be divided in two parts, 11 and 1859, that multiplied together give a square (20449 = 143²).

The spelling of 111859 in words is "one hundred eleven thousand, eight hundred fifty-nine".