9689889809 has 2 divisors, whose sum is σ = 9689889810. Its totient is φ = 9689889808.

The previous prime is 9689889793. The next prime is 9689889829. The reversal of 9689889809 is 9089889869.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8386896400 + 1302993409 = 91580^2 + 36097^2 .

It is a cyclic number.

It is not a de Polignac number, because 9689889809 - 2⁴ = 9689889793 is a prime.

It is not a weakly prime, because it can be changed into another prime (9689889829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4844944904 + 4844944905.

It is an arithmetic number, because the mean of its divisors is an integer number (4844944905).

Almost surely, 2^9689889809 is an apocalyptic number.

It is an amenable number.

9689889809 is a deficient number, since it is larger than the sum of its proper divisors (1).

9689889809 is an equidigital number, since it uses as much as digits as its factorization.

9689889809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 161243136, while the sum is 74.

The square root of 9689889809 is about 98437.2379183813. The cubic root of 9689889809 is about 2131.9300255732.

The spelling of 9689889809 in words is "nine billion, six hundred eighty-nine million, eight hundred eighty-nine thousand, eight hundred nine".