129099 has 8 divisors (see below), whose sum is σ = 179712. Its totient is φ = 82280.

The previous prime is 129097. The next prime is 129113. The reversal of 129099 is 990921.

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 129099 - 2¹ = 129097 is a prime.

It is not an unprimeable number, because it can be changed into a prime (129097) 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, 867 + ... + 1004.

It is an arithmetic number, because the mean of its divisors is an integer number (22464).

2¹²⁹⁰⁹⁹ is an apocalyptic number.

129099 is a deficient number, since it is larger than the sum of its proper divisors (50613).

129099 is a wasteful number, since it uses less digits than its factorization.

129099 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1897.

The product of its (nonzero) digits is 1458, while the sum is 30.

The square root of 129099 is about 359.3034928859. The cubic root of 129099 is about 50.5406658687.

The spelling of 129099 in words is "one hundred twenty-nine thousand, ninety-nine".