8409281 has 2 divisors, whose sum is σ = 8409282. Its totient is φ = 8409280.

The previous prime is 8409263. The next prime is 8409307. The reversal of 8409281 is 1829048.

It is a happy number.

8409281 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4243600 + 4165681 = 2060^2 + 2041^2 .

It is a cyclic number.

It is not a de Polignac number, because 8409281 - 2¹⁴ = 8392897 is a prime.

It is a super-2 number, since 2×8409281² = 141432013873922, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is equal to p₅₆₅₄₅₇ and since 8409281 and 565457 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (8409481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4204640 + 4204641.

It is an arithmetic number, because the mean of its divisors is an integer number (4204641).

Almost surely, 2^8409281 is an apocalyptic number.

It is an amenable number.

8409281 is a deficient number, since it is larger than the sum of its proper divisors (1).

8409281 is an equidigital number, since it uses as much as digits as its factorization.

8409281 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4608, while the sum is 32.

The square root of 8409281 is about 2899.8760318331. The cubic root of 8409281 is about 203.3541102720.

The spelling of 8409281 in words is "eight million, four hundred nine thousand, two hundred eighty-one".