9328991 has 4 divisors (see below), whose sum is σ = 10661712. Its totient is φ = 7996272.

The previous prime is 9328973. The next prime is 9328997. The reversal of 9328991 is 1998239.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1998239 = 149 ⋅13411.

It is a cyclic number.

It is not a de Polignac number, because 9328991 - 2²² = 5134687 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 (9328997) 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, 666350 + ... + 666363.

It is an arithmetic number, because the mean of its divisors is an integer number (2665428).

Almost surely, 2^9328991 is an apocalyptic number.

9328991 is a deficient number, since it is larger than the sum of its proper divisors (1332721).

9328991 is a wasteful number, since it uses less digits than its factorization.

9328991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1332720.

The product of its digits is 34992, while the sum is 41.

The square root of 9328991 is about 3054.3396995095. The cubic root of 9328991 is about 210.5126627867.

The spelling of 9328991 in words is "nine million, three hundred twenty-eight thousand, nine hundred ninety-one".