129908929 has 2 divisors, whose sum is σ = 129908930. Its totient is φ = 129908928.

The previous prime is 129908923. The next prime is 129908953. The reversal of 129908929 is 929809921.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 129049600 + 859329 = 11360^2 + 927^2 .

It is an emirp because it is prime and its reverse (929809921) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 129908929 - 2⁵ = 129908897 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (129908923) 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, 64954464 + 64954465.

It is an arithmetic number, because the mean of its divisors is an integer number (64954465).

Almost surely, 2^129908929 is an apocalyptic number.

It is an amenable number.

129908929 is a deficient number, since it is larger than the sum of its proper divisors (1).

129908929 is an equidigital number, since it uses as much as digits as its factorization.

129908929 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 209952, while the sum is 49.

The square root of 129908929 is about 11397.7598237548. The cubic root of 129908929 is about 506.4613801219.

The spelling of 129908929 in words is "one hundred twenty-nine million, nine hundred eight thousand, nine hundred twenty-nine".