8691689 has 2 divisors, whose sum is σ = 8691690. Its totient is φ = 8691688.

The previous prime is 8691673. The next prime is 8691731. The reversal of 8691689 is 9861968.

8691689 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 can be written as a sum of positive squares in only one way, i.e., 8456464 + 235225 = 2908^2 + 485^2 .

It is a cyclic number.

It is not a de Polignac number, because 8691689 - 2⁴ = 8691673 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (8691589) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4345844 + 4345845.

It is an arithmetic number, because the mean of its divisors is an integer number (4345845).

Almost surely, 2^8691689 is an apocalyptic number.

It is an amenable number.

8691689 is a deficient number, since it is larger than the sum of its proper divisors (1).

8691689 is an equidigital number, since it uses as much as digits as its factorization.

8691689 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 186624, while the sum is 47.

The square root of 8691689 is about 2948.1670576818. The cubic root of 8691689 is about 205.6054991161.

The spelling of 8691689 in words is "eight million, six hundred ninety-one thousand, six hundred eighty-nine".