9879521 has 2 divisors, whose sum is σ = 9879522. Its totient is φ = 9879520.

The previous prime is 9879479. The next prime is 9879557. The reversal of 9879521 is 1259789.

9879521 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8202496 + 1677025 = 2864^2 + 1295^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9879521 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (9872521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4939760 + 4939761.

It is an arithmetic number, because the mean of its divisors is an integer number (4939761).

Almost surely, 2^9879521 is an apocalyptic number.

It is an amenable number.

9879521 is a deficient number, since it is larger than the sum of its proper divisors (1).

9879521 is an equidigital number, since it uses as much as digits as its factorization.

9879521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 45360, while the sum is 41.

The square root of 9879521 is about 3143.1705330764. The cubic root of 9879521 is about 214.5747570980.

The spelling of 9879521 in words is "nine million, eight hundred seventy-nine thousand, five hundred twenty-one".