111985 has 4 divisors (see below), whose sum is σ = 134388. Its totient is φ = 89584.

The previous prime is 111977. The next prime is 111997. The reversal of 111985 is 589111.

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

It can be written as a sum of positive squares in 2 ways, for example, as 80656 + 31329 = 284^2 + 177^2 .

It is a cyclic number.

It is not a de Polignac number, because 111985 - 2³ = 111977 is a prime.

It is a Duffinian number.

111985 is a lucky number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11194 + ... + 11203.

It is an arithmetic number, because the mean of its divisors is an integer number (33597).

2¹¹¹⁹⁸⁵ is an apocalyptic number.

It is an amenable number.

111985 is a deficient number, since it is larger than the sum of its proper divisors (22403).

111985 is an equidigital number, since it uses as much as digits as its factorization.

111985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22402.

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

The square root of 111985 is about 334.6415993268. The cubic root of 111985 is about 48.2006932747.

The spelling of 111985 in words is "one hundred eleven thousand, nine hundred eighty-five".