128841329 has 2 divisors, whose sum is σ = 128841330. Its totient is φ = 128841328.

The previous prime is 128841319. The next prime is 128841347. The reversal of 128841329 is 923148821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 127690000 + 1151329 = 11300^2 + 1073^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128841329 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 128841292 and 128841301.

It is not a weakly prime, because it can be changed into another prime (128841319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64420664 + 64420665.

It is an arithmetic number, because the mean of its divisors is an integer number (64420665).

Almost surely, 2^128841329 is an apocalyptic number.

It is an amenable number.

128841329 is a deficient number, since it is larger than the sum of its proper divisors (1).

128841329 is an equidigital number, since it uses as much as digits as its factorization.

128841329 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27648, while the sum is 38.

The square root of 128841329 is about 11350.8294410585. The cubic root of 128841329 is about 505.0701846707.

The spelling of 128841329 in words is "one hundred twenty-eight million, eight hundred forty-one thousand, three hundred twenty-nine".