111815 has 16 divisors (see below), whose sum is σ = 155520. Its totient is φ = 76320.

The previous prime is 111799. The next prime is 111821. The reversal of 111815 is 518111.

It is not a de Polignac number, because 111815 - 2⁴ = 111799 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 111793 and 111802.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 992 + ... + 1098.

It is an arithmetic number, because the mean of its divisors is an integer number (9720).

2¹¹¹⁸¹⁵ is an apocalyptic number.

111815 is a deficient number, since it is larger than the sum of its proper divisors (43705).

111815 is a wasteful number, since it uses less digits than its factorization.

111815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142.

The product of its digits is 40, while the sum is 17.

The square root of 111815 is about 334.3874997664. The cubic root of 111815 is about 48.1762904001.

Adding to 111815 its reverse (518111), we get a palindrome (629926).

The spelling of 111815 in words is "one hundred eleven thousand, eight hundred fifteen".