129403649 has 2 divisors, whose sum is σ = 129403650. Its totient is φ = 129403648.

The previous prime is 129403613. The next prime is 129403691. The reversal of 129403649 is 946304921.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 129231424 + 172225 = 11368^2 + 415^2 .

It is a cyclic number.

It is not a de Polignac number, because 129403649 - 2¹⁶ = 129338113 is a prime.

It is not a weakly prime, because it can be changed into another prime (129403049) 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, 64701824 + 64701825.

It is an arithmetic number, because the mean of its divisors is an integer number (64701825).

Almost surely, 2^129403649 is an apocalyptic number.

It is an amenable number.

129403649 is a deficient number, since it is larger than the sum of its proper divisors (1).

129403649 is an equidigital number, since it uses as much as digits as its factorization.

129403649 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 129403649 is about 11375.5724691112. The cubic root of 129403649 is about 505.8039007965.

The spelling of 129403649 in words is "one hundred twenty-nine million, four hundred three thousand, six hundred forty-nine".