18103 has 4 divisors (see below), whose sum is σ = 18568. Its totient is φ = 17640.

The previous prime is 18097. The next prime is 18119. The reversal of 18103 is 30181.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18103 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a plaindrome in base 11 and base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18133) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 168 + ... + 253.

It is an arithmetic number, because the mean of its divisors is an integer number (4642).

2¹⁸¹⁰³ is an apocalyptic number.

18103 is a deficient number, since it is larger than the sum of its proper divisors (465).

18103 is an equidigital number, since it uses as much as digits as its factorization.

18103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 464.

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 18103 is about 134.5473894210. The cubic root of 18103 is about 26.2573071116.

Adding to 18103 its reverse (30181), we get a palindrome (48284).

It can be divided in two parts, 18 and 103, that added together give a palindrome (121).

The spelling of 18103 in words is "eighteen thousand, one hundred three".