9107921 has 4 divisors (see below), whose sum is σ = 9148272. Its totient is φ = 9067572.

The previous prime is 9107909. The next prime is 9107941. The reversal of 9107921 is 1297019.

9107921 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, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 9107921 - 2²² = 4913617 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (9107941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19835 + ... + 20288.

It is an arithmetic number, because the mean of its divisors is an integer number (2287068).

Almost surely, 2^9107921 is an apocalyptic number.

It is an amenable number.

9107921 is a deficient number, since it is larger than the sum of its proper divisors (40351).

9107921 is a wasteful number, since it uses less digits than its factorization.

9107921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40350.

The product of its (nonzero) digits is 1134, while the sum is 29.

The square root of 9107921 is about 3017.9332331912. The cubic root of 9107921 is about 208.8365059138.

The spelling of 9107921 in words is "nine million, one hundred seven thousand, nine hundred twenty-one".