18822241 has 2 divisors, whose sum is σ = 18822242. Its totient is φ = 18822240.

The previous prime is 18822187. The next prime is 18822253. The reversal of 18822241 is 14222881.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16851025 + 1971216 = 4105^2 + 1404^2 .

It is an emirp because it is prime and its reverse (14222881) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18822241 - 2¹⁵ = 18789473 is a prime.

It is not a weakly prime, because it can be changed into another prime (18822641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9411120 + 9411121.

It is an arithmetic number, because the mean of its divisors is an integer number (9411121).

Almost surely, 2^18822241 is an apocalyptic number.

It is an amenable number.

18822241 is a deficient number, since it is larger than the sum of its proper divisors (1).

18822241 is an equidigital number, since it uses as much as digits as its factorization.

18822241 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2048, while the sum is 28.

The square root of 18822241 is about 4338.4606717130. The cubic root of 18822241 is about 266.0053940150.

The spelling of 18822241 in words is "eighteen million, eight hundred twenty-two thousand, two hundred forty-one".