129729539 has 2 divisors, whose sum is σ = 129729540. Its totient is φ = 129729538.

The previous prime is 129729517. The next prime is 129729563. The reversal of 129729539 is 935927921.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-129729539 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 129729493 and 129729502.

It is not a weakly prime, because it can be changed into another prime (129729239) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64864769 + 64864770.

It is an arithmetic number, because the mean of its divisors is an integer number (64864770).

Almost surely, 2^129729539 is an apocalyptic number.

129729539 is a deficient number, since it is larger than the sum of its proper divisors (1).

129729539 is an equidigital number, since it uses as much as digits as its factorization.

129729539 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 306180, while the sum is 47.

The square root of 129729539 is about 11389.8875762669. The cubic root of 129729539 is about 506.2281501721.

The spelling of 129729539 in words is "one hundred twenty-nine million, seven hundred twenty-nine thousand, five hundred thirty-nine".