129378317 has 2 divisors, whose sum is σ = 129378318. Its totient is φ = 129378316.

The previous prime is 129378299. The next prime is 129378331. The reversal of 129378317 is 713873921.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 126652516 + 2725801 = 11254^2 + 1651^2 .

It is a cyclic number.

It is not a de Polignac number, because 129378317 - 2⁸ = 129378061 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 (129378017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64689158 + 64689159.

It is an arithmetic number, because the mean of its divisors is an integer number (64689159).

Almost surely, 2^129378317 is an apocalyptic number.

It is an amenable number.

129378317 is a deficient number, since it is larger than the sum of its proper divisors (1).

129378317 is an equidigital number, since it uses as much as digits as its factorization.

129378317 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 63504, while the sum is 41.

The square root of 129378317 is about 11374.4589761448. The cubic root of 129378317 is about 505.7708933280.

The spelling of 129378317 in words is "one hundred twenty-nine million, three hundred seventy-eight thousand, three hundred seventeen".