18111115 has 8 divisors (see below), whose sum is σ = 23709168. Its totient is φ = 13171680.

The previous prime is 18111101. The next prime is 18111131. The reversal of 18111115 is 51111181.

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

It is not a de Polignac number, because 18111115 - 2¹¹ = 18109067 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18111092 and 18111101.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 164592 + ... + 164701.

It is an arithmetic number, because the mean of its divisors is an integer number (2963646).

Almost surely, 2^18111115 is an apocalyptic number.

18111115 is a deficient number, since it is larger than the sum of its proper divisors (5598053).

18111115 is a wasteful number, since it uses less digits than its factorization.

18111115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 329309.

The product of its digits is 40, while the sum is 19.

The square root of 18111115 is about 4255.7155685031. The cubic root of 18111115 is about 262.6122996451.

Adding to 18111115 its reverse (51111181), we get a palindrome (69222296).

It can be divided in two parts, 1811 and 1115, that added together give a triangular number (2926 = T₇₆).

The spelling of 18111115 in words is "eighteen million, one hundred eleven thousand, one hundred fifteen".