129836947 has 2 divisors, whose sum is σ = 129836948. Its totient is φ = 129836946.

The previous prime is 129836933. The next prime is 129836969. The reversal of 129836947 is 749638921.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-129836947 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a self number, because there is not a number n which added to its sum of digits gives 129836947.

It is not a weakly prime, because it can be changed into another prime (129836977) 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, 64918473 + 64918474.

It is an arithmetic number, because the mean of its divisors is an integer number (64918474).

Almost surely, 2^129836947 is an apocalyptic number.

129836947 is a deficient number, since it is larger than the sum of its proper divisors (1).

129836947 is an equidigital number, since it uses as much as digits as its factorization.

129836947 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 653184, while the sum is 49.

The square root of 129836947 is about 11394.6016604355. The cubic root of 129836947 is about 506.3678201210.

The spelling of 129836947 in words is "one hundred twenty-nine million, eight hundred thirty-six thousand, nine hundred forty-seven".