18131303 has 2 divisors, whose sum is σ = 18131304. Its totient is φ = 18131302.

The previous prime is 18131297. The next prime is 18131359. The reversal of 18131303 is 30313181.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (30313181) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18131303 - 2¹⁶ = 18065767 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18131203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9065651 + 9065652.

It is an arithmetic number, because the mean of its divisors is an integer number (9065652).

Almost surely, 2^18131303 is an apocalyptic number.

18131303 is a deficient number, since it is larger than the sum of its proper divisors (1).

18131303 is an equidigital number, since it uses as much as digits as its factorization.

18131303 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 18131303 is about 4258.0867769457. The cubic root of 18131303 is about 262.7098391664.

Adding to 18131303 its reverse (30313181), we get a palindrome (48444484).

The spelling of 18131303 in words is "eighteen million, one hundred thirty-one thousand, three hundred three".