9716521 has 4 divisors (see below), whose sum is σ = 9723844. Its totient is φ = 9709200.

The previous prime is 9716513. The next prime is 9716569. The reversal of 9716521 is 1256179.

9716521 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 brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1256179 = 79 ⋅15901.

It can be written as a sum of positive squares in 2 ways, for example, as 931225 + 8785296 = 965^2 + 2964^2 .

It is a cyclic number.

It is not a de Polignac number, because 9716521 - 2³ = 9716513 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9716501) 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, 1050 + ... + 4531.

It is an arithmetic number, because the mean of its divisors is an integer number (2430961).

Almost surely, 2^9716521 is an apocalyptic number.

It is an amenable number.

9716521 is a deficient number, since it is larger than the sum of its proper divisors (7323).

9716521 is a wasteful number, since it uses less digits than its factorization.

9716521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7322.

The product of its digits is 3780, while the sum is 31.

The square root of 9716521 is about 3117.1334588047. The cubic root of 9716521 is about 213.3881334372.

The spelling of 9716521 in words is "nine million, seven hundred sixteen thousand, five hundred twenty-one".