129237528209 has 2 divisors, whose sum is σ = 129237528210. Its totient is φ = 129237528208.

The previous prime is 129237528169. The next prime is 129237528229. The reversal of 129237528209 is 902825732921.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 90321286225 + 38916241984 = 300535^2 + 197272^2 .

It is a cyclic number.

It is not a de Polignac number, because 129237528209 - 2¹² = 129237524113 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (129237528229) 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, 64618764104 + 64618764105.

It is an arithmetic number, because the mean of its divisors is an integer number (64618764105).

Almost surely, 2^129237528209 is an apocalyptic number.

It is an amenable number.

129237528209 is a deficient number, since it is larger than the sum of its proper divisors (1).

129237528209 is an equidigital number, since it uses as much as digits as its factorization.

129237528209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1088640, while the sum is 50.

The spelling of 129237528209 in words is "one hundred twenty-nine billion, two hundred thirty-seven million, five hundred twenty-eight thousand, two hundred nine".