9709521 has 4 divisors (see below), whose sum is σ = 12946032. Its totient is φ = 6473012.

The previous prime is 9709517. The next prime is 9709537. The reversal of 9709521 is 1259079.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1259079 = 3 ⋅419693.

It is a cyclic number.

It is not a de Polignac number, because 9709521 - 2² = 9709517 is a prime.

It is not an unprimeable number, because it can be changed into a prime (9709621) 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, 1618251 + ... + 1618256.

It is an arithmetic number, because the mean of its divisors is an integer number (3236508).

Almost surely, 2^9709521 is an apocalyptic number.

It is an amenable number.

9709521 is a deficient number, since it is larger than the sum of its proper divisors (3236511).

9709521 is a wasteful number, since it uses less digits than its factorization.

9709521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3236510.

The product of its (nonzero) digits is 5670, while the sum is 33.

The square root of 9709521 is about 3116.0104300211. The cubic root of 9709521 is about 213.3368779250.

The spelling of 9709521 in words is "nine million, seven hundred nine thousand, five hundred twenty-one".