129217339709 has 2 divisors, whose sum is σ = 129217339710. Its totient is φ = 129217339708.

The previous prime is 129217339703. The next prime is 129217339763. The reversal of 129217339709 is 907933712921.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 74556302500 + 54661037209 = 273050^2 + 233797^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-129217339709 is a prime.

It is a super-2 number, since 2×129217339709² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129217339703) 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, 64608669854 + 64608669855.

It is an arithmetic number, because the mean of its divisors is an integer number (64608669855).

Almost surely, 2^129217339709 is an apocalyptic number.

It is an amenable number.

129217339709 is a deficient number, since it is larger than the sum of its proper divisors (1).

129217339709 is an equidigital number, since it uses as much as digits as its factorization.

129217339709 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1285956, while the sum is 53.

The spelling of 129217339709 in words is "one hundred twenty-nine billion, two hundred seventeen million, three hundred thirty-nine thousand, seven hundred nine".