9281281 has 2 divisors, whose sum is σ = 9281282. Its totient is φ = 9281280.

The previous prime is 9281273. The next prime is 9281297. The reversal of 9281281 is 1821829.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8071281 + 1210000 = 2841^2 + 1100^2 .

It is a cyclic number.

It is not a de Polignac number, because 9281281 - 2³ = 9281273 is a prime.

It is a super-2 number, since 2×9281281² = 172284354001922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (9281081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4640640 + 4640641.

It is an arithmetic number, because the mean of its divisors is an integer number (4640641).

Almost surely, 2^9281281 is an apocalyptic number.

It is an amenable number.

9281281 is a deficient number, since it is larger than the sum of its proper divisors (1).

9281281 is an equidigital number, since it uses as much as digits as its factorization.

9281281 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2304, while the sum is 31.

The square root of 9281281 is about 3046.5194895159. The cubic root of 9281281 is about 210.1531837739.

It can be divided in two parts, 928 and 1281, that added together give a square (2209 = 47²).

The spelling of 9281281 in words is "nine million, two hundred eighty-one thousand, two hundred eighty-one".