129992909209 has 2 divisors, whose sum is σ = 129992909210. Its totient is φ = 129992909208.

The previous prime is 129992909183. The next prime is 129992909251. The reversal of 129992909209 is 902909299921.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 128717347984 + 1275561225 = 358772^2 + 35715^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-129992909209 is a prime.

It is not a weakly prime, because it can be changed into another prime (129992909009) by changing a digit.

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 as a sum of consecutive naturals, namely, 64996454604 + 64996454605.

It is an arithmetic number, because the mean of its divisors is an integer number (64996454605).

Almost surely, 2^129992909209 is an apocalyptic number.

It is an amenable number.

129992909209 is a deficient number, since it is larger than the sum of its proper divisors (1).

129992909209 is an equidigital number, since it uses as much as digits as its factorization.

129992909209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4251528, while the sum is 61.

The spelling of 129992909209 in words is "one hundred twenty-nine billion, nine hundred ninety-two million, nine hundred nine thousand, two hundred nine".