129555851 has 8 divisors (see below), whose sum is σ = 140774400. Its totient is φ = 118777320.

The previous prime is 129555821. The next prime is 129555857. The reversal of 129555851 is 158555921.

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 129555851 - 2¹⁰ = 129554827 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 129555799 and 129555808.

It is not an unprimeable number, because it can be changed into a prime (129555857) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 109391 + ... + 110568.

It is an arithmetic number, because the mean of its divisors is an integer number (17596800).

Almost surely, 2^129555851 is an apocalyptic number.

129555851 is a deficient number, since it is larger than the sum of its proper divisors (11218549).

129555851 is a wasteful number, since it uses less digits than its factorization.

129555851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 220009.

The product of its digits is 90000, while the sum is 41.

The square root of 129555851 is about 11382.2603642686. The cubic root of 129555851 is about 506.0021285980.

The spelling of 129555851 in words is "one hundred twenty-nine million, five hundred fifty-five thousand, eight hundred fifty-one".