129132247 has 8 divisors (see below), whose sum is σ = 132975360. Its totient is φ = 125322240.

The previous prime is 129132239. The next prime is 129132271. The reversal of 129132247 is 742231921.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 129132247 - 2³ = 129132239 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129132277) 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, 247 + ... + 16072.

It is an arithmetic number, because the mean of its divisors is an integer number (16621920).

Almost surely, 2^129132247 is an apocalyptic number.

129132247 is a deficient number, since it is larger than the sum of its proper divisors (3843113).

129132247 is a wasteful number, since it uses less digits than its factorization.

129132247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16553.

The product of its digits is 6048, while the sum is 31.

The square root of 129132247 is about 11363.6370498182. The cubic root of 129132247 is about 505.4500409313.

The spelling of 129132247 in words is "one hundred twenty-nine million, one hundred thirty-two thousand, two hundred forty-seven".