9117989 has 4 divisors (see below), whose sum is σ = 9157356. Its totient is φ = 9078624.

The previous prime is 9117973. The next prime is 9118019. The reversal of 9117989 is 9897119.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5841889 + 3276100 = 2417^2 + 1810^2 .

It is a cyclic number.

It is not a de Polignac number, because 9117989 - 2⁴ = 9117973 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9117289) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19334 + ... + 19799.

It is an arithmetic number, because the mean of its divisors is an integer number (2289339).

Almost surely, 2^9117989 is an apocalyptic number.

It is an amenable number.

9117989 is a deficient number, since it is larger than the sum of its proper divisors (39367).

9117989 is a wasteful number, since it uses less digits than its factorization.

9117989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39366.

The product of its digits is 40824, while the sum is 44.

The square root of 9117989 is about 3019.6008014305. The cubic root of 9117989 is about 208.9134276644.

The spelling of 9117989 in words is "nine million, one hundred seventeen thousand, nine hundred eighty-nine".