18221167 has 2 divisors, whose sum is σ = 18221168. Its totient is φ = 18221166.

The previous prime is 18221153. The next prime is 18221173. The reversal of 18221167 is 76112281.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18221167 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18261167) 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, 9110583 + 9110584.

It is an arithmetic number, because the mean of its divisors is an integer number (9110584).

Almost surely, 2^18221167 is an apocalyptic number.

18221167 is a deficient number, since it is larger than the sum of its proper divisors (1).

18221167 is an equidigital number, since it uses as much as digits as its factorization.

18221167 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1344, while the sum is 28.

The square root of 18221167 is about 4268.6258913144. The cubic root of 18221167 is about 263.1431461580.

The spelling of 18221167 in words is "eighteen million, two hundred twenty-one thousand, one hundred sixty-seven".