9144221 has 2 divisors, whose sum is σ = 9144222. Its totient is φ = 9144220.

The previous prime is 9144209. The next prime is 9144229. The reversal of 9144221 is 1224419.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9084196 + 60025 = 3014^2 + 245^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9144221 is a prime.

It is a Sophie Germain 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 (9144229) 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, 4572110 + 4572111.

It is an arithmetic number, because the mean of its divisors is an integer number (4572111).

Almost surely, 2^9144221 is an apocalyptic number.

It is an amenable number.

9144221 is a deficient number, since it is larger than the sum of its proper divisors (1).

9144221 is an equidigital number, since it uses as much as digits as its factorization.

9144221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 576, while the sum is 23.

The square root of 9144221 is about 3023.9413023404. The cubic root of 9144221 is about 209.1135803509.

The spelling of 9144221 in words is "nine million, one hundred forty-four thousand, two hundred twenty-one".