18163331 has 2 divisors, whose sum is σ = 18163332. Its totient is φ = 18163330.

The previous prime is 18163279. The next prime is 18163339. The reversal of 18163331 is 13336181.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18163331 is a prime.

It is a super-2 number, since 2×18163331² = 659813186031122, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18163331.

It is not a weakly prime, because it can be changed into another prime (18163339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9081665 + 9081666.

It is an arithmetic number, because the mean of its divisors is an integer number (9081666).

It is a self-describing number.

Almost surely, 2^18163331 is an apocalyptic number.

18163331 is a deficient number, since it is larger than the sum of its proper divisors (1).

18163331 is an equidigital number, since it uses as much as digits as its factorization.

18163331 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1296, while the sum is 26.

The square root of 18163331 is about 4261.8459615523. The cubic root of 18163331 is about 262.8644359108.

The spelling of 18163331 in words is "eighteen million, one hundred sixty-three thousand, three hundred thirty-one".