18066091 has 2 divisors, whose sum is σ = 18066092. Its totient is φ = 18066090.

The previous prime is 18066077. The next prime is 18066119. The reversal of 18066091 is 19066081.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18066091 - 2¹⁹ = 17541803 is a prime.

It is a plaindrome in base 16.

It is not a weakly prime, because it can be changed into another prime (18066011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9033045 + 9033046.

It is an arithmetic number, because the mean of its divisors is an integer number (9033046).

Almost surely, 2^18066091 is an apocalyptic number.

18066091 is a deficient number, since it is larger than the sum of its proper divisors (1).

18066091 is an equidigital number, since it uses as much as digits as its factorization.

18066091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 31.

The square root of 18066091 is about 4250.4224495925. The cubic root of 18066091 is about 262.3945021265.

The spelling of 18066091 in words is "eighteen million, sixty-six thousand, ninety-one".