18131003 has 12 divisors (see below), whose sum is σ = 20620320. Its totient is φ = 15911280.

The previous prime is 18130967. The next prime is 18131011. The reversal of 18131003 is 30013181.

It is not a de Polignac number, because 18131003 - 2¹² = 18126907 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 (18131203) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 926 + ... + 6092.

It is an arithmetic number, because the mean of its divisors is an integer number (1718360).

Almost surely, 2^18131003 is an apocalyptic number.

18131003 is a deficient number, since it is larger than the sum of its proper divisors (2489317).

18131003 is a wasteful number, since it uses less digits than its factorization.

18131003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5218 (or 5207 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 17.

The square root of 18131003 is about 4258.0515497114. The cubic root of 18131003 is about 262.7083902287.

Adding to 18131003 its reverse (30013181), we get a palindrome (48144184).

The spelling of 18131003 in words is "eighteen million, one hundred thirty-one thousand, three".