129703729 has 2 divisors, whose sum is σ = 129703730. Its totient is φ = 129703728.

The previous prime is 129703697. The next prime is 129703793. The reversal of 129703729 is 927307921.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 126517504 + 3186225 = 11248^2 + 1785^2 .

It is an emirp because it is prime and its reverse (927307921) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 129703729 - 2⁵ = 129703697 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 129703691 and 129703700.

It is not a weakly prime, because it can be changed into another prime (129703799) 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, 64851864 + 64851865.

It is an arithmetic number, because the mean of its divisors is an integer number (64851865).

Almost surely, 2^129703729 is an apocalyptic number.

It is an amenable number.

129703729 is a deficient number, since it is larger than the sum of its proper divisors (1).

129703729 is an equidigital number, since it uses as much as digits as its factorization.

129703729 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 47628, while the sum is 40.

The square root of 129703729 is about 11388.7544973101. The cubic root of 129703729 is about 506.1945761811.

The spelling of 129703729 in words is "one hundred twenty-nine million, seven hundred three thousand, seven hundred twenty-nine".