9128239 has 2 divisors, whose sum is σ = 9128240. Its totient is φ = 9128238.

The previous prime is 9128237. The next prime is 9128267. The reversal of 9128239 is 9328219.

9128239 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is an emirp because it is prime and its reverse (9328219) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9128239 - 2¹ = 9128237 is a prime.

It is a super-2 number, since 2×9128239² = 166649494482242, which contains 22 as substring.

Together with 9128237, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9128237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4564119 + 4564120.

It is an arithmetic number, because the mean of its divisors is an integer number (4564120).

Almost surely, 2^9128239 is an apocalyptic number.

9128239 is a deficient number, since it is larger than the sum of its proper divisors (1).

9128239 is an equidigital number, since it uses as much as digits as its factorization.

9128239 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7776, while the sum is 34.

The square root of 9128239 is about 3021.2975689263. The cubic root of 9128239 is about 208.9916817885.

The spelling of 9128239 in words is "nine million, one hundred twenty-eight thousand, two hundred thirty-nine".