129069809 has 8 divisors (see below), whose sum is σ = 141232800. Its totient is φ = 116978400.

The previous prime is 129069803. The next prime is 129069823. The reversal of 129069809 is 908960921.

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

It is not a de Polignac number, because 129069809 - 2⁸ = 129069553 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 129069809.

It is not an unprimeable number, because it can be changed into a prime (129069803) 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, 14084 + ... + 21365.

It is an arithmetic number, because the mean of its divisors is an integer number (17654100).

Almost surely, 2^129069809 is an apocalyptic number.

It is an amenable number.

129069809 is a deficient number, since it is larger than the sum of its proper divisors (12162991).

129069809 is a wasteful number, since it uses less digits than its factorization.

129069809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35791.

The product of its (nonzero) digits is 69984, while the sum is 44.

The square root of 129069809 is about 11360.8894458137. The cubic root of 129069809 is about 505.3685627613.

The spelling of 129069809 in words is "one hundred twenty-nine million, sixty-nine thousand, eight hundred nine".