9915281 has 2 divisors, whose sum is σ = 9915282. Its totient is φ = 9915280.

The previous prime is 9915229. The next prime is 9915289. The reversal of 9915281 is 1825199.

9915281 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9096256 + 819025 = 3016^2 + 905^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9915281 is a prime.

It is a super-2 number, since 2×9915281² = 196625594617922, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (9915289) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4957640 + 4957641.

It is an arithmetic number, because the mean of its divisors is an integer number (4957641).

Almost surely, 2^9915281 is an apocalyptic number.

It is an amenable number.

9915281 is a deficient number, since it is larger than the sum of its proper divisors (1).

9915281 is an equidigital number, since it uses as much as digits as its factorization.

9915281 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6480, while the sum is 35.

The square root of 9915281 is about 3148.8539184916. The cubic root of 9915281 is about 214.8333375798.

The spelling of 9915281 in words is "nine million, nine hundred fifteen thousand, two hundred eighty-one".