129109 has 8 divisors (see below), whose sum is σ = 137088. Its totient is φ = 121440.

The previous prime is 129097. The next prime is 129113. The reversal of 129109 is 901921.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 129109 - 2⁷ = 128981 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 129109.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129119) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1894 + ... + 1960.

It is an arithmetic number, because the mean of its divisors is an integer number (17136).

2¹²⁹¹⁰⁹ is an apocalyptic number.

It is an amenable number.

129109 is a deficient number, since it is larger than the sum of its proper divisors (7979).

129109 is an equidigital number, since it uses as much as digits as its factorization.

129109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155.

The product of its (nonzero) digits is 162, while the sum is 22.

The square root of 129109 is about 359.3174084288. The cubic root of 129109 is about 50.5419707939.

The spelling of 129109 in words is "one hundred twenty-nine thousand, one hundred nine".