8681009 has 2 divisors, whose sum is σ = 8681010. Its totient is φ = 8681008.

The previous prime is 8681003. The next prime is 8681021. The reversal of 8681009 is 9001868.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8151025 + 529984 = 2855^2 + 728^2 .

It is a cyclic number.

It is not a de Polignac number, because 8681009 - 2⁴ = 8680993 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is an Ulam number.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (8681003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4340504 + 4340505.

It is an arithmetic number, because the mean of its divisors is an integer number (4340505).

Almost surely, 2^8681009 is an apocalyptic number.

It is an amenable number.

8681009 is a deficient number, since it is larger than the sum of its proper divisors (1).

8681009 is an equidigital number, since it uses as much as digits as its factorization.

8681009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 32.

The square root of 8681009 is about 2946.3552060130. The cubic root of 8681009 is about 205.5212513271.

The spelling of 8681009 in words is "eight million, six hundred eighty-one thousand, nine".