9917689 has 2 divisors, whose sum is σ = 9917690. Its totient is φ = 9917688.

The previous prime is 9917683. The next prime is 9917701. The reversal of 9917689 is 9867199.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6969600 + 2948089 = 2640^2 + 1717^2 .

It is a cyclic number.

It is not a de Polignac number, because 9917689 - 2²³ = 1529081 is a prime.

It is not a weakly prime, because it can be changed into another prime (9917683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4958844 + 4958845.

It is an arithmetic number, because the mean of its divisors is an integer number (4958845).

Almost surely, 2^9917689 is an apocalyptic number.

It is an amenable number.

9917689 is a deficient number, since it is larger than the sum of its proper divisors (1).

9917689 is an equidigital number, since it uses as much as digits as its factorization.

9917689 is an evil number, because the sum of its binary digits is even.

The product of its digits is 244944, while the sum is 49.

The square root of 9917689 is about 3149.2362566184. The cubic root of 9917689 is about 214.8507274653.

The spelling of 9917689 in words is "nine million, nine hundred seventeen thousand, six hundred eighty-nine".