129312317 has 2 divisors, whose sum is σ = 129312318. Its totient is φ = 129312316.

The previous prime is 129312307. The next prime is 129312329. The reversal of 129312317 is 713213921.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 95043001 + 34269316 = 9749^2 + 5854^2 .

It is a cyclic number.

It is not a de Polignac number, because 129312317 - 2⁸ = 129312061 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 129312317.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129312307) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64656158 + 64656159.

It is an arithmetic number, because the mean of its divisors is an integer number (64656159).

Almost surely, 2^129312317 is an apocalyptic number.

It is an amenable number.

129312317 is a deficient number, since it is larger than the sum of its proper divisors (1).

129312317 is an equidigital number, since it uses as much as digits as its factorization.

129312317 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2268, while the sum is 29.

The square root of 129312317 is about 11371.5573691557. The cubic root of 129312317 is about 505.6848754193.

The spelling of 129312317 in words is "one hundred twenty-nine million, three hundred twelve thousand, three hundred seventeen".