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BaseRepresentation
bin10000111101001
3102220112
42013221
5234211
6104105
734211
oct20751
912815
108681
116582
125035
133c4a
143241
15288b
hex21e9

8681 has 2 divisors, whose sum is σ = 8682. Its totient is φ = 8680.

The previous prime is 8677. The next prime is 8689. The reversal of 8681 is 1868.

8681 is digitally balanced in base 2, 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., 8281 + 400 = 91^2 + 20^2 .

It is a cyclic number.

It is not a de Polignac number, because 8681 - 22 = 8677 is a prime.

It is a super-2 number, since 2×86812 = 150719522, which contains 22 as substring.

It is a Chen prime.

It is a plaindrome in base 15.

It is not a weakly prime, because it can be changed into another prime (8689) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4340 + 4341.

It is an arithmetic number, because the mean of its divisors is an integer number (4341).

It is an amenable number.

8681 is a deficient number, since it is larger than the sum of its proper divisors (1).

8681 is an equidigital number, since it uses as much as digits as its factorization.

8681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 384, while the sum is 23.

The square root of 8681 is about 93.1718841711. The cubic root of 8681 is about 20.5521180303.

The spelling of 8681 in words is "eight thousand, six hundred eighty-one".