129555849 has 8 divisors (see below), whose sum is σ = 180251712. Its totient is φ = 82615280.

The previous prime is 129555821. The next prime is 129555857. The reversal of 129555849 is 948555921.

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 129555849 - 2⁵ = 129555817 is a prime.

It is a super-2 number, since 2×129555849² = 33569436020221602, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 129555798 and 129555807.

It is not an unprimeable number, because it can be changed into a prime (129555949) 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, 938742 + ... + 938879.

It is an arithmetic number, because the mean of its divisors is an integer number (22531464).

Almost surely, 2^129555849 is an apocalyptic number.

It is an amenable number.

129555849 is a deficient number, since it is larger than the sum of its proper divisors (50695863).

129555849 is a wasteful number, since it uses less digits than its factorization.

129555849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1877647.

The product of its digits is 648000, while the sum is 48.

The square root of 129555849 is about 11382.2602764126. The cubic root of 129555849 is about 506.0021259942.

The spelling of 129555849 in words is "one hundred twenty-nine million, five hundred fifty-five thousand, eight hundred forty-nine".