18103331 has 2 divisors, whose sum is σ = 18103332. Its totient is φ = 18103330.

The previous prime is 18103313. The next prime is 18103357. The reversal of 18103331 is 13330181.

It is a happy number.

Together with previous prime (18103313) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is an emirp because it is prime and its reverse (13330181) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18103331 is a prime.

It is a super-2 number, since 2×18103331² = 655461186591122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (18103831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9051665 + 9051666.

It is an arithmetic number, because the mean of its divisors is an integer number (9051666).

It is a self-describing number.

Almost surely, 2^18103331 is an apocalyptic number.

18103331 is a deficient number, since it is larger than the sum of its proper divisors (1).

18103331 is an equidigital number, since it uses as much as digits as its factorization.

18103331 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 18103331 is about 4254.8009354140. The cubic root of 18103331 is about 262.5746714249.

The spelling of 18103331 in words is "eighteen million, one hundred three thousand, three hundred thirty-one".