8681639 has 2 divisors, whose sum is σ = 8681640. Its totient is φ = 8681638.

The previous prime is 8681623. The next prime is 8681663. The reversal of 8681639 is 9361868.

It is a happy number.

8681639 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 8681639 - 2⁴ = 8681623 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 8681596 and 8681605.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8681669) 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, 4340819 + 4340820.

It is an arithmetic number, because the mean of its divisors is an integer number (4340820).

Almost surely, 2^8681639 is an apocalyptic number.

8681639 is a deficient number, since it is larger than the sum of its proper divisors (1).

8681639 is an equidigital number, since it uses as much as digits as its factorization.

8681639 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 62208, while the sum is 41.

The square root of 8681639 is about 2946.4621158264. The cubic root of 8681639 is about 205.5262229172.

The spelling of 8681639 in words is "eight million, six hundred eighty-one thousand, six hundred thirty-nine".