Base | Representation |
---|---|
bin | 11001000101111001101 |
3 | 1112202212122 |
4 | 3020233031 |
5 | 202302341 |
6 | 25342325 |
7 | 6663101 |
oct | 3105715 |
9 | 1482778 |
10 | 822221 |
11 | 511824 |
12 | 3379a5 |
13 | 22a32a |
14 | 175901 |
15 | 11394b |
hex | c8bcd |
822221 has 2 divisors, whose sum is σ = 822222. Its totient is φ = 822220.
The previous prime is 822197. The next prime is 822223. The reversal of 822221 is 122228.
It is a strong prime.
It can be written as a sum of positive squares in only one way, i.e., 448900 + 373321 = 670^2 + 611^2 .
It is a cyclic number.
It is a de Polignac number, because none of the positive numbers 2k-822221 is a prime.
Together with 822223, it forms a pair of twin primes.
It is a Chen prime.
It is a nialpdrome in base 10.
It is a self number, because there is not a number n which added to its sum of digits gives 822221.
It is a congruent number.
It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 822221.
It is not a weakly prime, because it can be changed into another prime (822223) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (11) of ones.
It is a good prime.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 411110 + 411111.
It is an arithmetic number, because the mean of its divisors is an integer number (411111).
2822221 is an apocalyptic number.
It is an amenable number.
822221 is a deficient number, since it is larger than the sum of its proper divisors (1).
822221 is an equidigital number, since it uses as much as digits as its factorization.
822221 is an odious number, because the sum of its binary digits is odd.
The product of its digits is 128, while the sum is 17.
The square root of 822221 is about 906.7640266354. The cubic root of 822221 is about 93.6834455039.
Adding to 822221 its reverse (122228), we get a palindrome (944449).
The spelling of 822221 in words is "eight hundred twenty-two thousand, two hundred twenty-one".
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