129319205 has 8 divisors (see below), whose sum is σ = 158111352. Its totient is φ = 101503168.

The previous prime is 129319193. The next prime is 129319213. The reversal of 129319205 is 502913921.

It can be written as a sum of positive squares in 4 ways, for example, as 29658916 + 99660289 = 5446^2 + 9983^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-129319205 is a prime.

It is a Duffinian number.

It is a congruent 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, 243734 + ... + 244263.

It is an arithmetic number, because the mean of its divisors is an integer number (19763919).

Almost surely, 2^129319205 is an apocalyptic number.

It is an amenable number.

129319205 is a deficient number, since it is larger than the sum of its proper divisors (28792147).

129319205 is an equidigital number, since it uses as much as digits as its factorization.

129319205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 488055.

The product of its (nonzero) digits is 4860, while the sum is 32.

The square root of 129319205 is about 11371.8602260140. The cubic root of 129319205 is about 505.6938539288.

The spelling of 129319205 in words is "one hundred twenty-nine million, three hundred nineteen thousand, two hundred five".