9886521 has 4 divisors (see below), whose sum is σ = 13182032. Its totient is φ = 6591012.

The previous prime is 9886507. The next prime is 9886529. The reversal of 9886521 is 1256889.

9886521 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 9886521 - 2¹¹ = 9884473 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 9886521.

It is not an unprimeable number, because it can be changed into a prime (9886529) 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, 1647751 + ... + 1647756.

It is an arithmetic number, because the mean of its divisors is an integer number (3295508).

Almost surely, 2^9886521 is an apocalyptic number.

It is an amenable number.

9886521 is a deficient number, since it is larger than the sum of its proper divisors (3295511).

9886521 is a wasteful number, since it uses less digits than its factorization.

9886521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3295510.

The product of its digits is 34560, while the sum is 39.

The square root of 9886521 is about 3144.2838612314. The cubic root of 9886521 is about 214.6254231405.

The spelling of 9886521 in words is "nine million, eight hundred eighty-six thousand, five hundred twenty-one".