9879911 has 2 divisors, whose sum is σ = 9879912. Its totient is φ = 9879910.

The previous prime is 9879901. The next prime is 9879913. The reversal of 9879911 is 1199789.

9879911 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is an emirp because it is prime and its reverse (1199789) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9879911 - 2²² = 5685607 is a prime.

It is a super-2 number, since 2×9879911² = 195225282735842, which contains 22 as substring.

Together with 9879913, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9879913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4939955 + 4939956.

It is an arithmetic number, because the mean of its divisors is an integer number (4939956).

Almost surely, 2^9879911 is an apocalyptic number.

9879911 is a deficient number, since it is larger than the sum of its proper divisors (1).

9879911 is an equidigital number, since it uses as much as digits as its factorization.

9879911 is an evil number, because the sum of its binary digits is even.

The product of its digits is 40824, while the sum is 44.

The square root of 9879911 is about 3143.2325717325. The cubic root of 9879911 is about 214.5775805498.

The spelling of 9879911 in words is "nine million, eight hundred seventy-nine thousand, nine hundred eleven".