9659989 has 2 divisors, whose sum is σ = 9659990. Its totient is φ = 9659988.

The previous prime is 9659983. The next prime is 9660019. The reversal of 9659989 is 9899569.

9659989 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., 6300100 + 3359889 = 2510^2 + 1833^2 .

It is a cyclic number.

It is not a de Polignac number, because 9659989 - 2³ = 9659981 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9659981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4829994 + 4829995.

It is an arithmetic number, because the mean of its divisors is an integer number (4829995).

Almost surely, 2^9659989 is an apocalyptic number.

It is an amenable number.

9659989 is a deficient number, since it is larger than the sum of its proper divisors (1).

9659989 is an equidigital number, since it uses as much as digits as its factorization.

9659989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1574640, while the sum is 55.

The square root of 9659989 is about 3108.0522839875. The cubic root of 9659989 is about 212.9734881445.

It can be divided in two parts, 9659 and 989, that added together give a cube (10648 = 22³).

The spelling of 9659989 in words is "nine million, six hundred fifty-nine thousand, nine hundred eighty-nine".