129317 has 4 divisors (see below), whose sum is σ = 130860. Its totient is φ = 127776.

The previous prime is 129313. The next prime is 129341. The reversal of 129317 is 713921.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 713921 = 13 ⋅54917.

It can be written as a sum of positive squares in 2 ways, for example, as 83521 + 45796 = 289^2 + 214^2 .

It is a cyclic number.

It is not a de Polignac number, because 129317 - 2² = 129313 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 129292 and 129301.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 129317.

It is not an unprimeable number, because it can be changed into a prime (129313) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 638 + ... + 815.

It is an arithmetic number, because the mean of its divisors is an integer number (32715).

2¹²⁹³¹⁷ is an apocalyptic number.

It is an amenable number.

129317 is a deficient number, since it is larger than the sum of its proper divisors (1543).

129317 is an equidigital number, since it uses as much as digits as its factorization.

129317 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1542.

The product of its digits is 378, while the sum is 23.

The square root of 129317 is about 359.6067296367. The cubic root of 129317 is about 50.5690979745.

The spelling of 129317 in words is "one hundred twenty-nine thousand, three hundred seventeen".