9925521 has 4 divisors (see below), whose sum is σ = 13234032. Its totient is φ = 6617012.

The previous prime is 9925519. The next prime is 9925537. The reversal of 9925521 is 1255299.

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 9925521 - 2¹ = 9925519 is a prime.

It is not an unprimeable number, because it can be changed into a prime (9925541) 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, 1654251 + ... + 1654256.

It is an arithmetic number, because the mean of its divisors is an integer number (3308508).

Almost surely, 2^9925521 is an apocalyptic number.

It is an amenable number.

9925521 is a deficient number, since it is larger than the sum of its proper divisors (3308511).

9925521 is a wasteful number, since it uses less digits than its factorization.

9925521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3308510.

The product of its digits is 8100, while the sum is 33.

The square root of 9925521 is about 3150.4794873162. The cubic root of 9925521 is about 214.9072684648.

The spelling of 9925521 in words is "nine million, nine hundred twenty-five thousand, five hundred twenty-one".