129336817 has 2 divisors, whose sum is σ = 129336818. Its totient is φ = 129336816.

The previous prime is 129336811. The next prime is 129336829. The reversal of 129336817 is 718633921.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 125798656 + 3538161 = 11216^2 + 1881^2 .

It is a cyclic number.

It is not a de Polignac number, because 129336817 - 2⁷ = 129336689 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 129336817.

It is not a weakly prime, because it can be changed into another prime (129336811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64668408 + 64668409.

It is an arithmetic number, because the mean of its divisors is an integer number (64668409).

Almost surely, 2^129336817 is an apocalyptic number.

It is an amenable number.

129336817 is a deficient number, since it is larger than the sum of its proper divisors (1).

129336817 is an equidigital number, since it uses as much as digits as its factorization.

129336817 is an evil number, because the sum of its binary digits is even.

The product of its digits is 54432, while the sum is 40.

The square root of 129336817 is about 11372.6345672408. The cubic root of 129336817 is about 505.7168097248.

The spelling of 129336817 in words is "one hundred twenty-nine million, three hundred thirty-six thousand, eight hundred seventeen".