8720281 has 2 divisors, whose sum is σ = 8720282. Its totient is φ = 8720280.

The previous prime is 8720233. The next prime is 8720311. The reversal of 8720281 is 1820278.

8720281 is digitally balanced in base 3, 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., 5480281 + 3240000 = 2341^2 + 1800^2 .

It is a cyclic number.

It is not a de Polignac number, because 8720281 - 2¹⁵ = 8687513 is a prime.

It is a super-2 number, since 2×8720281² = 152086601437922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (8720081) 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, 4360140 + 4360141.

It is an arithmetic number, because the mean of its divisors is an integer number (4360141).

Almost surely, 2^8720281 is an apocalyptic number.

It is an amenable number.

8720281 is a deficient number, since it is larger than the sum of its proper divisors (1).

8720281 is an equidigital number, since it uses as much as digits as its factorization.

8720281 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1792, while the sum is 28.

The square root of 8720281 is about 2953.0121909670. The cubic root of 8720281 is about 205.8307042159.

The spelling of 8720281 in words is "eight million, seven hundred twenty thousand, two hundred eighty-one".