9216281 has 2 divisors, whose sum is σ = 9216282. Its totient is φ = 9216280.

The previous prime is 9216257. The next prime is 9216283. The reversal of 9216281 is 1826129.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4910656 + 4305625 = 2216^2 + 2075^2 .

It is an emirp because it is prime and its reverse (1826129) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9216281 - 2²² = 5021977 is a prime.

It is a super-2 number, since 2×9216281² = 169879670941922, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 9216283, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (9216283) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4608140 + 4608141.

It is an arithmetic number, because the mean of its divisors is an integer number (4608141).

Almost surely, 2^9216281 is an apocalyptic number.

It is an amenable number.

9216281 is a deficient number, since it is larger than the sum of its proper divisors (1).

9216281 is an equidigital number, since it uses as much as digits as its factorization.

9216281 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1728, while the sum is 29.

The square root of 9216281 is about 3035.8328346600. The cubic root of 9216281 is about 209.6614423841.

The spelling of 9216281 in words is "nine million, two hundred sixteen thousand, two hundred eighty-one".