129829129 has 4 divisors (see below), whose sum is σ = 129990420. Its totient is φ = 129667840.

The previous prime is 129829121. The next prime is 129829207. The reversal of 129829129 is 921928921.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 921928921 = 17 ⋅54231113.

It can be written as a sum of positive squares in 2 ways, for example, as 60140025 + 69689104 = 7755^2 + 8348^2 .

It is a cyclic number.

It is not a de Polignac number, because 129829129 - 2³ = 129829121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129829121) 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 3 ways as a sum of consecutive naturals, for example, 79432 + ... + 81049.

It is an arithmetic number, because the mean of its divisors is an integer number (32497605).

Almost surely, 2^129829129 is an apocalyptic number.

It is an amenable number.

129829129 is a deficient number, since it is larger than the sum of its proper divisors (161291).

129829129 is an equidigital number, since it uses as much as digits as its factorization.

129829129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161290.

The product of its digits is 46656, while the sum is 43.

The square root of 129829129 is about 11394.2585980835. The cubic root of 129829129 is about 506.3576564422.

The spelling of 129829129 in words is "one hundred twenty-nine million, eight hundred twenty-nine thousand, one hundred twenty-nine".