111855 has 8 divisors (see below), whose sum is σ = 178992. Its totient is φ = 59648.

The previous prime is 111847. The next prime is 111857. The reversal of 111855 is 558111.

111855 is nontrivially palindromic in base 13.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 111855 - 2³ = 111847 is a prime.

111855 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 polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3714 + ... + 3743.

It is an arithmetic number, because the mean of its divisors is an integer number (22374).

2¹¹¹⁸⁵⁵ is an apocalyptic number.

111855 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

111855 is a deficient number, since it is larger than the sum of its proper divisors (67137).

111855 is an equidigital number, since it uses as much as digits as its factorization.

111855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7465.

The product of its digits is 200, while the sum is 21.

The square root of 111855 is about 334.4473052665. The cubic root of 111855 is about 48.1820344770.

Adding to 111855 its reverse (558111), we get a palindrome (669966).

The spelling of 111855 in words is "one hundred eleven thousand, eight hundred fifty-five".