18165227 has 2 divisors, whose sum is σ = 18165228. Its totient is φ = 18165226.

The previous prime is 18165211. The next prime is 18165229. The reversal of 18165227 is 72256181.

It is a strong prime.

It is an emirp because it is prime and its reverse (72256181) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18165227 - 2⁴ = 18165211 is a prime.

Together with 18165229, 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 = 18165193 and 18165202.

It is not a weakly prime, because it can be changed into another prime (18165229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9082613 + 9082614.

It is an arithmetic number, because the mean of its divisors is an integer number (9082614).

Almost surely, 2^18165227 is an apocalyptic number.

18165227 is a deficient number, since it is larger than the sum of its proper divisors (1).

18165227 is an equidigital number, since it uses as much as digits as its factorization.

18165227 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6720, while the sum is 32.

The square root of 18165227 is about 4262.0683945709. The cubic root of 18165227 is about 262.8735820605.

The spelling of 18165227 in words is "eighteen million, one hundred sixty-five thousand, two hundred twenty-seven".