129617 has 4 divisors (see below), whose sum is σ = 130416. Its totient is φ = 128820.

The previous prime is 129607. The next prime is 129629. The reversal of 129617 is 716921.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 716921 = 137 ⋅5233.

It is a cyclic number.

It is not a de Polignac number, because 129617 - 2⁶ = 129553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129607) 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, 59 + ... + 512.

It is an arithmetic number, because the mean of its divisors is an integer number (32604).

2¹²⁹⁶¹⁷ is an apocalyptic number.

It is an amenable number.

129617 is a deficient number, since it is larger than the sum of its proper divisors (799).

129617 is an equidigital number, since it uses as much as digits as its factorization.

129617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 798.

The product of its digits is 756, while the sum is 26.

The square root of 129617 is about 360.0236103369. The cubic root of 129617 is about 50.6081725305.

The spelling of 129617 in words is "one hundred twenty-nine thousand, six hundred seventeen".