129075305 has 8 divisors (see below), whose sum is σ = 164001672. Its totient is φ = 97186048.

The previous prime is 129075283. The next prime is 129075311. The reversal of 129075305 is 503570921.

It can be written as a sum of positive squares in 4 ways, for example, as 27206656 + 101868649 = 5216^2 + 10093^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 129075305 - 2⁸ = 129075049 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

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 in 7 ways as a sum of consecutive naturals, for example, 759182 + ... + 759351.

It is an arithmetic number, because the mean of its divisors is an integer number (20500209).

Almost surely, 2^129075305 is an apocalyptic number.

It is an amenable number.

129075305 is a deficient number, since it is larger than the sum of its proper divisors (34926367).

129075305 is a wasteful number, since it uses less digits than its factorization.

129075305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1518555.

The product of its (nonzero) digits is 9450, while the sum is 32.

The square root of 129075305 is about 11361.1313257087. The cubic root of 129075305 is about 505.3757357948.

The spelling of 129075305 in words is "one hundred twenty-nine million, seventy-five thousand, three hundred five".