129437449 has 2 divisors, whose sum is σ = 129437450. Its totient is φ = 129437448.

The previous prime is 129437447. The next prime is 129437467. The reversal of 129437449 is 944734921.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 78057225 + 51380224 = 8835^2 + 7168^2 .

It is a cyclic number.

It is not a de Polignac number, because 129437449 - 2¹ = 129437447 is a prime.

Together with 129437447, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (129437447) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64718724 + 64718725.

It is an arithmetic number, because the mean of its divisors is an integer number (64718725).

Almost surely, 2^129437449 is an apocalyptic number.

It is an amenable number.

129437449 is a deficient number, since it is larger than the sum of its proper divisors (1).

129437449 is an equidigital number, since it uses as much as digits as its factorization.

129437449 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 217728, while the sum is 43.

The square root of 129437449 is about 11377.0580116302. The cubic root of 129437449 is about 505.8479353187.

The spelling of 129437449 in words is "one hundred twenty-nine million, four hundred thirty-seven thousand, four hundred forty-nine".