129839329 has 2 divisors, whose sum is σ = 129839330. Its totient is φ = 129839328.

The previous prime is 129839323. The next prime is 129839357. The reversal of 129839329 is 923938921.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 74857104 + 54982225 = 8652^2 + 7415^2 .

It is an emirp because it is prime and its reverse (923938921) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 129839329 - 2³ = 129839321 is a prime.

It is equal to p_7369687 and since 129839329 and 7369687 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (129839321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64919664 + 64919665.

It is an arithmetic number, because the mean of its divisors is an integer number (64919665).

Almost surely, 2^129839329 is an apocalyptic number.

It is an amenable number.

129839329 is a deficient number, since it is larger than the sum of its proper divisors (1).

129839329 is an equidigital number, since it uses as much as digits as its factorization.

129839329 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 209952, while the sum is 46.

The square root of 129839329 is about 11394.7061831361. The cubic root of 129839329 is about 506.3709167249.

The spelling of 129839329 in words is "one hundred twenty-nine million, eight hundred thirty-nine thousand, three hundred twenty-nine".