9118991 has 8 divisors (see below), whose sum is σ = 10758144. Its totient is φ = 7563960.

The previous prime is 9118979. The next prime is 9118997. The reversal of 9118991 is 1998119.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 9118991 - 2⁶ = 9118927 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9118997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20795 + ... + 21228.

It is an arithmetic number, because the mean of its divisors is an integer number (1344768).

Almost surely, 2^9118991 is an apocalyptic number.

9118991 is a deficient number, since it is larger than the sum of its proper divisors (1639153).

9118991 is a wasteful number, since it uses less digits than its factorization.

9118991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42061.

The product of its digits is 5832, while the sum is 38.

The square root of 9118991 is about 3019.7667128439. The cubic root of 9118991 is about 208.9210800677.

The spelling of 9118991 in words is "nine million, one hundred eighteen thousand, nine hundred ninety-one".