9117987 has 4 divisors (see below), whose sum is σ = 12157320. Its totient is φ = 6078656.

The previous prime is 9117973. The next prime is 9118019. The reversal of 9117987 is 7897119.

It is a happy number.

9117987 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 9117987 - 2⁴ = 9117971 is a prime.

It is not an unprimeable number, because it can be changed into a prime (9117917) 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, 1519662 + ... + 1519667.

It is an arithmetic number, because the mean of its divisors is an integer number (3039330).

Almost surely, 2^9117987 is an apocalyptic number.

9117987 is a deficient number, since it is larger than the sum of its proper divisors (3039333).

9117987 is a wasteful number, since it uses less digits than its factorization.

9117987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3039332.

The product of its digits is 31752, while the sum is 42.

The square root of 9117987 is about 3019.6004702609. The cubic root of 9117987 is about 208.9134123896.

The spelling of 9117987 in words is "nine million, one hundred seventeen thousand, nine hundred eighty-seven".