129078317 has 2 divisors, whose sum is σ = 129078318. Its totient is φ = 129078316.

The previous prime is 129078307. The next prime is 129078359. The reversal of 129078317 is 713870921.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 85174441 + 43903876 = 9229^2 + 6626^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-129078317 is a prime.

It is a super-2 number, since 2×129078317² = 33322423839104978, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129078307) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64539158 + 64539159.

It is an arithmetic number, because the mean of its divisors is an integer number (64539159).

Almost surely, 2^129078317 is an apocalyptic number.

It is an amenable number.

129078317 is a deficient number, since it is larger than the sum of its proper divisors (1).

129078317 is an equidigital number, since it uses as much as digits as its factorization.

129078317 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21168, while the sum is 38.

The square root of 129078317 is about 11361.2638821568. The cubic root of 129078317 is about 505.3796667814.

The spelling of 129078317 in words is "one hundred twenty-nine million, seventy-eight thousand, three hundred seventeen".