129550865 has 8 divisors (see below), whose sum is σ = 157781760. Its totient is φ = 102093552.

The previous prime is 129550853. The next prime is 129550871. The reversal of 129550865 is 568055921.

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 129550865 - 2⁴ = 129550849 is a prime.

It is an unprimeable number.

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, 193025 + ... + 193694.

It is an arithmetic number, because the mean of its divisors is an integer number (19722720).

Almost surely, 2^129550865 is an apocalyptic number.

It is an amenable number.

129550865 is a deficient number, since it is larger than the sum of its proper divisors (28230895).

129550865 is an equidigital number, since it uses as much as digits as its factorization.

129550865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 386791.

The product of its (nonzero) digits is 108000, while the sum is 41.

The square root of 129550865 is about 11382.0413371240. The cubic root of 129550865 is about 505.9956372946.

The spelling of 129550865 in words is "one hundred twenty-nine million, five hundred fifty thousand, eight hundred sixty-five".