18508069 has 2 divisors, whose sum is σ = 18508070. Its totient is φ = 18508068.

The previous prime is 18508051. The next prime is 18508079. The reversal of 18508069 is 96080581.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17430625 + 1077444 = 4175^2 + 1038^2 .

It is an emirp because it is prime and its reverse (96080581) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18508069 - 2⁷ = 18507941 is a prime.

It is a super-2 number, since 2×18508069² = 685097236217522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18508079) 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, 9254034 + 9254035.

It is an arithmetic number, because the mean of its divisors is an integer number (9254035).

Almost surely, 2^18508069 is an apocalyptic number.

It is an amenable number.

18508069 is a deficient number, since it is larger than the sum of its proper divisors (1).

18508069 is an equidigital number, since it uses as much as digits as its factorization.

18508069 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17280, while the sum is 37.

The square root of 18508069 is about 4302.1005334604. The cubic root of 18508069 is about 264.5170699018.

The spelling of 18508069 in words is "eighteen million, five hundred eight thousand, sixty-nine".