129706517 has 2 divisors, whose sum is σ = 129706518. Its totient is φ = 129706516.

The previous prime is 129706513. The next prime is 129706537. The reversal of 129706517 is 715607921.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 91278916 + 38427601 = 9554^2 + 6199^2 .

It is a cyclic number.

It is not a de Polignac number, because 129706517 - 2² = 129706513 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129706513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64853258 + 64853259.

It is an arithmetic number, because the mean of its divisors is an integer number (64853259).

Almost surely, 2^129706517 is an apocalyptic number.

It is an amenable number.

129706517 is a deficient number, since it is larger than the sum of its proper divisors (1).

129706517 is an equidigital number, since it uses as much as digits as its factorization.

129706517 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 26460, while the sum is 38.

The square root of 129706517 is about 11388.8768980967. The cubic root of 129706517 is about 506.1982030631.

The spelling of 129706517 in words is "one hundred twenty-nine million, seven hundred six thousand, five hundred seventeen".