129509244709 has 16 divisors (see below), whose sum is σ = 144032477680. Its totient is φ = 115673287680.

The previous prime is 129509244677. The next prime is 129509244749. The reversal of 129509244709 is 907442905921.

It can be written as a sum of positive squares in 8 ways, for example, as 23578523809 + 105930720900 = 153553^2 + 325470^2 .

It is a cyclic number.

It is not a de Polignac number, because 129509244709 - 2⁵ = 129509244677 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129509244749) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 656724 + ... + 830845.

It is an arithmetic number, because the mean of its divisors is an integer number (9002029855).

Almost surely, 2^129509244709 is an apocalyptic number.

It is an amenable number.

129509244709 is a deficient number, since it is larger than the sum of its proper divisors (14523232971).

129509244709 is a wasteful number, since it uses less digits than its factorization.

129509244709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1487800.

The product of its (nonzero) digits is 1632960, while the sum is 52.

The spelling of 129509244709 in words is "one hundred twenty-nine billion, five hundred nine million, two hundred forty-four thousand, seven hundred nine".