128331239 has 2 divisors, whose sum is σ = 128331240. Its totient is φ = 128331238.

The previous prime is 128331233. The next prime is 128331253. The reversal of 128331239 is 932133821.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 128331239 - 2²⁰ = 127282663 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128331233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64165619 + 64165620.

It is an arithmetic number, because the mean of its divisors is an integer number (64165620).

Almost surely, 2^128331239 is an apocalyptic number.

128331239 is a deficient number, since it is larger than the sum of its proper divisors (1).

128331239 is an equidigital number, since it uses as much as digits as its factorization.

128331239 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7776, while the sum is 32.

The square root of 128331239 is about 11328.3378745516. The cubic root of 128331239 is about 504.4027694491.

The spelling of 128331239 in words is "one hundred twenty-eight million, three hundred thirty-one thousand, two hundred thirty-nine".