9315921 has 4 divisors (see below), whose sum is σ = 12421232. Its totient is φ = 6210612.

The previous prime is 9315913. The next prime is 9315959. The reversal of 9315921 is 1295139.

9315921 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 not a de Polignac number, because 9315921 - 2³ = 9315913 is a prime.

It is an Ulam number.

It is a Duffinian number.

9315921 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (9315991) 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, 1552651 + ... + 1552656.

It is an arithmetic number, because the mean of its divisors is an integer number (3105308).

Almost surely, 2^9315921 is an apocalyptic number.

It is an amenable number.

9315921 is a deficient number, since it is larger than the sum of its proper divisors (3105311).

9315921 is a wasteful number, since it uses less digits than its factorization.

9315921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3105310.

The product of its digits is 2430, while the sum is 30.

The square root of 9315921 is about 3052.1993709455. The cubic root of 9315921 is about 210.4143067975.

The spelling of 9315921 in words is "nine million, three hundred fifteen thousand, nine hundred twenty-one".