9717989 has 2 divisors, whose sum is σ = 9717990. Its totient is φ = 9717988.

The previous prime is 9717977. The next prime is 9717997. The reversal of 9717989 is 9897179.

9717989 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8236900 + 1481089 = 2870^2 + 1217^2 .

It is a cyclic number.

It is not a de Polignac number, because 9717989 - 2⁸ = 9717733 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9717919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4858994 + 4858995.

It is an arithmetic number, because the mean of its divisors is an integer number (4858995).

Almost surely, 2^9717989 is an apocalyptic number.

It is an amenable number.

9717989 is a deficient number, since it is larger than the sum of its proper divisors (1).

9717989 is an equidigital number, since it uses as much as digits as its factorization.

9717989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 285768, while the sum is 50.

The square root of 9717989 is about 3117.3689226654. The cubic root of 9717989 is about 213.3988793275.

The spelling of 9717989 in words is "nine million, seven hundred seventeen thousand, nine hundred eighty-nine".