129944329 has 2 divisors, whose sum is σ = 129944330. Its totient is φ = 129944328.

The previous prime is 129944327. The next prime is 129944357. The reversal of 129944329 is 923449921.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 75951225 + 53993104 = 8715^2 + 7348^2 .

It is an emirp because it is prime and its reverse (923449921) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 129944329 - 2¹ = 129944327 is a prime.

Together with 129944327, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (129944327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64972164 + 64972165.

It is an arithmetic number, because the mean of its divisors is an integer number (64972165).

Almost surely, 2^129944329 is an apocalyptic number.

It is an amenable number.

129944329 is a deficient number, since it is larger than the sum of its proper divisors (1).

129944329 is an equidigital number, since it uses as much as digits as its factorization.

129944329 is an evil number, because the sum of its binary digits is even.

The product of its digits is 139968, while the sum is 43.

The square root of 129944329 is about 11399.3126547174. The cubic root of 129944329 is about 506.5073792813.

The spelling of 129944329 in words is "one hundred twenty-nine million, nine hundred forty-four thousand, three hundred twenty-nine".