129969305 has 8 divisors (see below), whose sum is σ = 156407112. Its totient is φ = 103679488.

The previous prime is 129969289. The next prime is 129969319. The reversal of 129969305 is 503969921.

It can be written as a sum of positive squares in 4 ways, for example, as 43349056 + 86620249 = 6584^2 + 9307^2 .

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 129969305 - 2⁴ = 129969289 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 (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35054 + ... + 38583.

It is an arithmetic number, because the mean of its divisors is an integer number (19550889).

Almost surely, 2^129969305 is an apocalyptic number.

It is an amenable number.

129969305 is a deficient number, since it is larger than the sum of its proper divisors (26437807).

129969305 is an equidigital number, since it uses as much as digits as its factorization.

129969305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73995.

The product of its (nonzero) digits is 131220, while the sum is 44.

The square root of 129969305 is about 11400.4081067302. The cubic root of 129969305 is about 506.5398283513.

The spelling of 129969305 in words is "one hundred twenty-nine million, nine hundred sixty-nine thousand, three hundred five".