129839573 has 2 divisors, whose sum is σ = 129839574. Its totient is φ = 129839572.

The previous prime is 129839561. The next prime is 129839587. The reversal of 129839573 is 375938921.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 129458884 + 380689 = 11378^2 + 617^2 .

It is a cyclic number.

It is not a de Polignac number, because 129839573 - 2⁶ = 129839509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129839503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64919786 + 64919787.

It is an arithmetic number, because the mean of its divisors is an integer number (64919787).

Almost surely, 2^129839573 is an apocalyptic number.

It is an amenable number.

129839573 is a deficient number, since it is larger than the sum of its proper divisors (1).

129839573 is an equidigital number, since it uses as much as digits as its factorization.

129839573 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 408240, while the sum is 47.

The square root of 129839573 is about 11394.7168898573. The cubic root of 129839573 is about 506.3712339231.

The spelling of 129839573 in words is "one hundred twenty-nine million, eight hundred thirty-nine thousand, five hundred seventy-three".