129459817 has 2 divisors, whose sum is σ = 129459818. Its totient is φ = 129459816.

The previous prime is 129459797. The next prime is 129459823. The reversal of 129459817 is 718954921.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 103815721 + 25644096 = 10189^2 + 5064^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-129459817 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (129459877) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64729908 + 64729909.

It is an arithmetic number, because the mean of its divisors is an integer number (64729909).

Almost surely, 2^129459817 is an apocalyptic number.

It is an amenable number.

129459817 is a deficient number, since it is larger than the sum of its proper divisors (1).

129459817 is an equidigital number, since it uses as much as digits as its factorization.

129459817 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 181440, while the sum is 46.

The square root of 129459817 is about 11378.0410001019. The cubic root of 129459817 is about 505.8770720562.

The spelling of 129459817 in words is "one hundred twenty-nine million, four hundred fifty-nine thousand, eight hundred seventeen".