129452329 has 4 divisors (see below), whose sum is σ = 129497940. Its totient is φ = 129406720.

The previous prime is 129452291. The next prime is 129452353. The reversal of 129452329 is 923254921.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 100000000 + 29452329 = 10000^2 + 5427^2 .

It is a cyclic number.

It is not a de Polignac number, because 129452329 - 2¹⁵ = 129419561 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129452359) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18244 + ... + 24325.

It is an arithmetic number, because the mean of its divisors is an integer number (32374485).

Almost surely, 2^129452329 is an apocalyptic number.

129452329 is the 6082-nd nonagonal number.

It is an amenable number.

129452329 is a deficient number, since it is larger than the sum of its proper divisors (45611).

129452329 is an equidigital number, since it uses as much as digits as its factorization.

129452329 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45610.

The product of its digits is 38880, while the sum is 37.

The square root of 129452329 is about 11377.7119404562. The cubic root of 129452329 is about 505.8673185006.

The spelling of 129452329 in words is "one hundred twenty-nine million, four hundred fifty-two thousand, three hundred twenty-nine".