129307009 has 8 divisors (see below), whose sum is σ = 139379240. Its totient is φ = 119252736.

The previous prime is 129307001. The next prime is 129307019. The reversal of 129307009 is 900703921.

It can be written as a sum of positive squares in 4 ways, for example, as 71774784 + 57532225 = 8472^2 + 7585^2 .

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 129307009 - 2³ = 129307001 is a prime.

It is not an unprimeable number, because it can be changed into a prime (129307001) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13027 + ... + 20695.

It is an arithmetic number, because the mean of its divisors is an integer number (17422405).

Almost surely, 2^129307009 is an apocalyptic number.

It is an amenable number.

129307009 is a deficient number, since it is larger than the sum of its proper divisors (10072231).

129307009 is a wasteful number, since it uses less digits than its factorization.

129307009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8979.

The product of its (nonzero) digits is 3402, while the sum is 31.

The square root of 129307009 is about 11371.3239774443. The cubic root of 129307009 is about 505.6779562227.

The spelling of 129307009 in words is "one hundred twenty-nine million, three hundred seven thousand, nine".