8909281 has 2 divisors, whose sum is σ = 8909282. Its totient is φ = 8909280.

The previous prime is 8909261. The next prime is 8909287. The reversal of 8909281 is 1829098.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6170256 + 2739025 = 2484^2 + 1655^2 .

It is a cyclic number.

It is not a de Polignac number, because 8909281 - 2⁵ = 8909249 is a prime.

It is a super-2 number, since 2×8909281² = 158750575873922, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 8909281.

It is not a weakly prime, because it can be changed into another prime (8909287) 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 as a sum of consecutive naturals, namely, 4454640 + 4454641.

It is an arithmetic number, because the mean of its divisors is an integer number (4454641).

Almost surely, 2^8909281 is an apocalyptic number.

It is an amenable number.

8909281 is a deficient number, since it is larger than the sum of its proper divisors (1).

8909281 is an equidigital number, since it uses as much as digits as its factorization.

8909281 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10368, while the sum is 37.

The square root of 8909281 is about 2984.8418718585. The cubic root of 8909281 is about 207.3071203257.

The spelling of 8909281 in words is "eight million, nine hundred nine thousand, two hundred eighty-one".