129047998909 has 2 divisors, whose sum is σ = 129047998910. Its totient is φ = 129047998908.

The previous prime is 129047998907. The next prime is 129047998927. The reversal of 129047998909 is 909899740921.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 115636042809 + 13411956100 = 340053^2 + 115810^2 .

It is a cyclic number.

It is not a de Polignac number, because 129047998909 - 2¹ = 129047998907 is a prime.

Together with 129047998907, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129047998901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64523999454 + 64523999455.

It is an arithmetic number, because the mean of its divisors is an integer number (64523999455).

Almost surely, 2^129047998909 is an apocalyptic number.

It is an amenable number.

129047998909 is a deficient number, since it is larger than the sum of its proper divisors (1).

129047998909 is an equidigital number, since it uses as much as digits as its factorization.

129047998909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 26453952, while the sum is 67.

The spelling of 129047998909 in words is "one hundred twenty-nine billion, forty-seven million, nine hundred ninety-eight thousand, nine hundred nine".