129189009 has 8 divisors (see below), whose sum is σ = 173118400. Its totient is φ = 85692816.

The previous prime is 129189007. The next prime is 129189023. The reversal of 129189009 is 900981921.

It is a happy number.

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

It is not a de Polignac number, because 129189009 - 2¹ = 129189007 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129189007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 107602 + ... + 108795.

It is an arithmetic number, because the mean of its divisors is an integer number (21639800).

Almost surely, 2^129189009 is an apocalyptic number.

It is an amenable number.

129189009 is a deficient number, since it is larger than the sum of its proper divisors (43929391).

129189009 is a wasteful number, since it uses less digits than its factorization.

129189009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 216599.

The product of its (nonzero) digits is 11664, while the sum is 39.

The square root of 129189009 is about 11366.1343032713. The cubic root of 129189009 is about 505.5240894440.

The spelling of 129189009 in words is "one hundred twenty-nine million, one hundred eighty-nine thousand, nine".