9805221 has 6 divisors (see below), whose sum is σ = 14163110. Its totient is φ = 6536808.

The previous prime is 9805217. The next prime is 9805223. The reversal of 9805221 is 1225089.

It can be written as a sum of positive squares in only one way, i.e., 8328996 + 1476225 = 2886^2 + 1215^2 .

It is not a de Polignac number, because 9805221 - 2² = 9805217 is a prime.

It is a super-2 number, since 2×9805221² = 192284717717682, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9805223) 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 in 5 ways as a sum of consecutive naturals, for example, 544726 + ... + 544743.

Almost surely, 2^9805221 is an apocalyptic number.

It is an amenable number.

9805221 is a deficient number, since it is larger than the sum of its proper divisors (4357889).

9805221 is a wasteful number, since it uses less digits than its factorization.

9805221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1089475 (or 1089472 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

The square root of 9805221 is about 3131.3289511005. The cubic root of 9805221 is about 214.0354921189.

The spelling of 9805221 in words is "nine million, eight hundred five thousand, two hundred twenty-one".