129944429 has 2 divisors, whose sum is σ = 129944430. Its totient is φ = 129944428.

The previous prime is 129944383. The next prime is 129944443. The reversal of 129944429 is 924449921.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 116424100 + 13520329 = 10790^2 + 3677^2 .

It is a cyclic number.

It is not a de Polignac number, because 129944429 - 2²⁴ = 113167213 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 129944429.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129944329) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64972214 + 64972215.

It is an arithmetic number, because the mean of its divisors is an integer number (64972215).

Almost surely, 2^129944429 is an apocalyptic number.

It is an amenable number.

129944429 is a deficient number, since it is larger than the sum of its proper divisors (1).

129944429 is an equidigital number, since it uses as much as digits as its factorization.

129944429 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 186624, while the sum is 44.

The square root of 129944429 is about 11399.3170409459. The cubic root of 129944429 is about 506.5075092106.

The spelling of 129944429 in words is "one hundred twenty-nine million, nine hundred forty-four thousand, four hundred twenty-nine".