9218213 has 2 divisors, whose sum is σ = 9218214. Its totient is φ = 9218212.

The previous prime is 9218207. The next prime is 9218257. The reversal of 9218213 is 3128129.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5466244 + 3751969 = 2338^2 + 1937^2 .

It is an emirp because it is prime and its reverse (3128129) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9218213 - 2⁴ = 9218197 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9218263) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4609106 + 4609107.

It is an arithmetic number, because the mean of its divisors is an integer number (4609107).

Almost surely, 2^9218213 is an apocalyptic number.

It is an amenable number.

9218213 is a deficient number, since it is larger than the sum of its proper divisors (1).

9218213 is an equidigital number, since it uses as much as digits as its factorization.

9218213 is an evil number, because the sum of its binary digits is even.

The product of its digits is 864, while the sum is 26.

The square root of 9218213 is about 3036.1510173244. The cubic root of 9218213 is about 209.6760917351.

The spelling of 9218213 in words is "nine million, two hundred eighteen thousand, two hundred thirteen".