129117289 has 8 divisors (see below), whose sum is σ = 149024448. Its totient is φ = 109575600.

The previous prime is 129117281. The next prime is 129117371. The reversal of 129117289 is 982711921.

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 129117289 - 2³ = 129117281 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129117281) 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, 90607 + ... + 92020.

It is an arithmetic number, because the mean of its divisors is an integer number (18628056).

Almost surely, 2^129117289 is an apocalyptic number.

It is an amenable number.

129117289 is a deficient number, since it is larger than the sum of its proper divisors (19907159).

129117289 is a wasteful number, since it uses less digits than its factorization.

129117289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 182735.

The product of its digits is 18144, while the sum is 40.

The square root of 129117289 is about 11362.9788787976. The cubic root of 129117289 is about 505.4305239534.

The spelling of 129117289 in words is "one hundred twenty-nine million, one hundred seventeen thousand, two hundred eighty-nine".