9715521 has 4 divisors (see below), whose sum is σ = 12954032. Its totient is φ = 6477012.

The previous prime is 9715513. The next prime is 9715523. The reversal of 9715521 is 1255179.

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 9715521 - 2³ = 9715513 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 (9715523) 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 3 ways as a sum of consecutive naturals, for example, 1619251 + ... + 1619256.

It is an arithmetic number, because the mean of its divisors is an integer number (3238508).

Almost surely, 2^9715521 is an apocalyptic number.

It is an amenable number.

9715521 is a deficient number, since it is larger than the sum of its proper divisors (3238511).

9715521 is a wasteful number, since it uses less digits than its factorization.

9715521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3238510.

The product of its digits is 3150, while the sum is 30.

The square root of 9715521 is about 3116.9730508941. The cubic root of 9715521 is about 213.3808127287.

The spelling of 9715521 in words is "nine million, seven hundred fifteen thousand, five hundred twenty-one".