129839291 has 2 divisors, whose sum is σ = 129839292. Its totient is φ = 129839290.

The previous prime is 129839287. The next prime is 129839321. The reversal of 129839291 is 192938921.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 129839291 - 2² = 129839287 is a prime.

It is not a weakly prime, because it can be changed into another prime (129839201) 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, 64919645 + 64919646.

It is an arithmetic number, because the mean of its divisors is an integer number (64919646).

Almost surely, 2^129839291 is an apocalyptic number.

129839291 is a deficient number, since it is larger than the sum of its proper divisors (1).

129839291 is an equidigital number, since it uses as much as digits as its factorization.

129839291 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 69984, while the sum is 44.

The square root of 129839291 is about 11394.7045156950. The cubic root of 129839291 is about 506.3708673251.

The spelling of 129839291 in words is "one hundred twenty-nine million, eight hundred thirty-nine thousand, two hundred ninety-one".