9909139 has 2 divisors, whose sum is σ = 9909140. Its totient is φ = 9909138.

The previous prime is 9909091. The next prime is 9909143. The reversal of 9909139 is 9319099.

9909139 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 is an emirp because it is prime and its reverse (9319099) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9909139 - 2¹¹ = 9907091 is a prime.

It is not a weakly prime, because it can be changed into another prime (9909439) 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 as a sum of consecutive naturals, namely, 4954569 + 4954570.

It is an arithmetic number, because the mean of its divisors is an integer number (4954570).

Almost surely, 2^9909139 is an apocalyptic number.

9909139 is a deficient number, since it is larger than the sum of its proper divisors (1).

9909139 is an equidigital number, since it uses as much as digits as its factorization.

9909139 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 19683, while the sum is 40.

The square root of 9909139 is about 3147.8784919371. The cubic root of 9909139 is about 214.7889690639.

Subtracting from 9909139 its sum of digits (40), we obtain a palindrome (9909099).

The spelling of 9909139 in words is "nine million, nine hundred nine thousand, one hundred thirty-nine".