129501709 has 2 divisors, whose sum is σ = 129501710. Its totient is φ = 129501708.

The previous prime is 129501683. The next prime is 129501721. The reversal of 129501709 is 907105921.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 65853225 + 63648484 = 8115^2 + 7978^2 .

It is a cyclic number.

It is not a de Polignac number, because 129501709 - 2¹⁹ = 128977421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129501769) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64750854 + 64750855.

It is an arithmetic number, because the mean of its divisors is an integer number (64750855).

Almost surely, 2^129501709 is an apocalyptic number.

It is an amenable number.

129501709 is a deficient number, since it is larger than the sum of its proper divisors (1).

129501709 is an equidigital number, since it uses as much as digits as its factorization.

129501709 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5670, while the sum is 34.

The square root of 129501709 is about 11379.8817656424. The cubic root of 129501709 is about 505.9316318863.

The spelling of 129501709 in words is "one hundred twenty-nine million, five hundred one thousand, seven hundred nine".