129452217 has 8 divisors (see below), whose sum is σ = 172655520. Its totient is φ = 86275200.

The previous prime is 129452209. The next prime is 129452291. The reversal of 129452217 is 712254921.

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

It is not a de Polignac number, because 129452217 - 2³ = 129452209 is a prime.

It is not an unprimeable number, because it can be changed into a prime (129452207) 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, 16009 + ... + 22697.

It is an arithmetic number, because the mean of its divisors is an integer number (21581940).

Almost surely, 2^129452217 is an apocalyptic number.

It is an amenable number.

129452217 is a deficient number, since it is larger than the sum of its proper divisors (43203303).

129452217 is an equidigital number, since it uses as much as digits as its factorization.

129452217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13143.

The product of its digits is 10080, while the sum is 33.

The square root of 129452217 is about 11377.7070185517. The cubic root of 129452217 is about 505.8671726113.

The spelling of 129452217 in words is "one hundred twenty-nine million, four hundred fifty-two thousand, two hundred seventeen".