18131103 has 6 divisors (see below), whose sum is σ = 26189384. Its totient is φ = 12087396.

The previous prime is 18131081. The next prime is 18131117. The reversal of 18131103 is 30113181.

It is a happy number.

It is not a de Polignac number, because 18131103 - 2⁶ = 18131039 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18131173) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1007275 + ... + 1007292.

Almost surely, 2^18131103 is an apocalyptic number.

18131103 is a deficient number, since it is larger than the sum of its proper divisors (8058281).

18131103 is a wasteful number, since it uses less digits than its factorization.

18131103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2014573 (or 2014570 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

The square root of 18131103 is about 4258.0632921552. The cubic root of 18131103 is about 262.7088732097.

Adding to 18131103 its reverse (30113181), we get a palindrome (48244284).

It can be divided in two parts, 1813 and 1103, that added together give a square (2916 = 54²).

The spelling of 18131103 in words is "eighteen million, one hundred thirty-one thousand, one hundred three".