129129728029 has 2 divisors, whose sum is σ = 129129728030. Its totient is φ = 129129728028.

The previous prime is 129129727999. The next prime is 129129728093. The reversal of 129129728029 is 920827921921.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 70506180900 + 58623547129 = 265530^2 + 242123^2 .

It is a cyclic number.

It is not a de Polignac number, because 129129728029 - 2⁵ = 129129727997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129129728099) 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, 64564864014 + 64564864015.

It is an arithmetic number, because the mean of its divisors is an integer number (64564864015).

Almost surely, 2^129129728029 is an apocalyptic number.

It is an amenable number.

129129728029 is a deficient number, since it is larger than the sum of its proper divisors (1).

129129728029 is an equidigital number, since it uses as much as digits as its factorization.

129129728029 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 653184, while the sum is 52.

The spelling of 129129728029 in words is "one hundred twenty-nine billion, one hundred twenty-nine million, seven hundred twenty-eight thousand, twenty-nine".