129817529 has 2 divisors, whose sum is σ = 129817530. Its totient is φ = 129817528.

The previous prime is 129817507. The next prime is 129817609. The reversal of 129817529 is 925718921.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 97555129 + 32262400 = 9877^2 + 5680^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-129817529 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 129817529.

It is not a weakly prime, because it can be changed into another prime (129816529) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64908764 + 64908765.

It is an arithmetic number, because the mean of its divisors is an integer number (64908765).

Almost surely, 2^129817529 is an apocalyptic number.

It is an amenable number.

129817529 is a deficient number, since it is larger than the sum of its proper divisors (1).

129817529 is an equidigital number, since it uses as much as digits as its factorization.

129817529 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 90720, while the sum is 44.

The square root of 129817529 is about 11393.7495584202. The cubic root of 129817529 is about 506.3425752767.

The spelling of 129817529 in words is "one hundred twenty-nine million, eight hundred seventeen thousand, five hundred twenty-nine".