129320447 has 2 divisors, whose sum is σ = 129320448. Its totient is φ = 129320446.

The previous prime is 129320407. The next prime is 129320509. The reversal of 129320447 is 744023921.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 129320447 - 2⁶ = 129320383 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129320407) 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, 64660223 + 64660224.

It is an arithmetic number, because the mean of its divisors is an integer number (64660224).

Almost surely, 2^129320447 is an apocalyptic number.

129320447 is a deficient number, since it is larger than the sum of its proper divisors (1).

129320447 is an equidigital number, since it uses as much as digits as its factorization.

129320447 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12096, while the sum is 32.

The square root of 129320447 is about 11371.9148343628. The cubic root of 129320447 is about 505.6954728421.

The spelling of 129320447 in words is "one hundred twenty-nine million, three hundred twenty thousand, four hundred forty-seven".