18082213 has 2 divisors, whose sum is σ = 18082214. Its totient is φ = 18082212.

The previous prime is 18082201. The next prime is 18082217. The reversal of 18082213 is 31228081.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17164449 + 917764 = 4143^2 + 958^2 .

It is an emirp because it is prime and its reverse (31228081) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18082213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18082217) 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, 9041106 + 9041107.

It is an arithmetic number, because the mean of its divisors is an integer number (9041107).

Almost surely, 2^18082213 is an apocalyptic number.

It is an amenable number.

18082213 is a deficient number, since it is larger than the sum of its proper divisors (1).

18082213 is an equidigital number, since it uses as much as digits as its factorization.

18082213 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 768, while the sum is 25.

The square root of 18082213 is about 4252.3185440416. The cubic root of 18082213 is about 262.4725316685.

The spelling of 18082213 in words is "eighteen million, eighty-two thousand, two hundred thirteen".