129036449 has 2 divisors, whose sum is σ = 129036450. Its totient is φ = 129036448.

The previous prime is 129036437. The next prime is 129036469. The reversal of 129036449 is 944630921.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 118113424 + 10923025 = 10868^2 + 3305^2 .

It is a cyclic number.

It is not a de Polignac number, because 129036449 - 2⁴ = 129036433 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (129036469) 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 as a sum of consecutive naturals, namely, 64518224 + 64518225.

It is an arithmetic number, because the mean of its divisors is an integer number (64518225).

Almost surely, 2^129036449 is an apocalyptic number.

It is an amenable number.

129036449 is a deficient number, since it is larger than the sum of its proper divisors (1).

129036449 is an equidigital number, since it uses as much as digits as its factorization.

129036449 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 46656, while the sum is 38.

The square root of 129036449 is about 11359.4211560273. The cubic root of 129036449 is about 505.3250190178.

The spelling of 129036449 in words is "one hundred twenty-nine million, thirty-six thousand, four hundred forty-nine".