129544217 has 16 divisors (see below), whose sum is σ = 144296640. Its totient is φ = 115315200.

The previous prime is 129544201. The next prime is 129544229. The reversal of 129544217 is 712445921.

It is not a de Polignac number, because 129544217 - 2⁴ = 129544201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129544277) 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 15 ways as a sum of consecutive naturals, for example, 110042 + ... + 111212.

It is an arithmetic number, because the mean of its divisors is an integer number (9018540).

Almost surely, 2^129544217 is an apocalyptic number.

It is an amenable number.

129544217 is a deficient number, since it is larger than the sum of its proper divisors (14752423).

129544217 is a wasteful number, since it uses less digits than its factorization.

129544217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1384.

The product of its digits is 20160, while the sum is 35.

The square root of 129544217 is about 11381.7492943747. The cubic root of 129544217 is about 505.9869819644.

It can be divided in two parts, 12954 and 4217, that added together give a palindrome (17171).

The spelling of 129544217 in words is "one hundred twenty-nine million, five hundred forty-four thousand, two hundred seventeen".