18016331 has 2 divisors, whose sum is σ = 18016332. Its totient is φ = 18016330.

The previous prime is 18016319. The next prime is 18016333. The reversal of 18016331 is 13361081.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18016331 - 2⁶ = 18016267 is a prime.

It is a super-2 number, since 2×18016331² = 649176365403122, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 18016333, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 18016297 and 18016306.

It is not a weakly prime, because it can be changed into another prime (18016333) 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 as a sum of consecutive naturals, namely, 9008165 + 9008166.

It is an arithmetic number, because the mean of its divisors is an integer number (9008166).

Almost surely, 2^18016331 is an apocalyptic number.

18016331 is a deficient number, since it is larger than the sum of its proper divisors (1).

18016331 is an equidigital number, since it uses as much as digits as its factorization.

18016331 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 18016331 is about 4244.5648775817. The cubic root of 18016331 is about 262.1533734776.

The spelling of 18016331 in words is "eighteen million, sixteen thousand, three hundred thirty-one".