129423750529 has 2 divisors, whose sum is σ = 129423750530. Its totient is φ = 129423750528.

The previous prime is 129423750503. The next prime is 129423750539. The reversal of 129423750529 is 925057324921.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 125868848400 + 3554902129 = 354780^2 + 59623^2 .

It is a cyclic number.

It is not a de Polignac number, because 129423750529 - 2²¹ = 129421653377 is a prime.

It is not a weakly prime, because it can be changed into another prime (129423750539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64711875264 + 64711875265.

It is an arithmetic number, because the mean of its divisors is an integer number (64711875265).

Almost surely, 2^129423750529 is an apocalyptic number.

It is an amenable number.

129423750529 is a deficient number, since it is larger than the sum of its proper divisors (1).

129423750529 is an equidigital number, since it uses as much as digits as its factorization.

129423750529 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1360800, while the sum is 49.

The spelling of 129423750529 in words is "one hundred twenty-nine billion, four hundred twenty-three million, seven hundred fifty thousand, five hundred twenty-nine".