129636847 has 2 divisors, whose sum is σ = 129636848. Its totient is φ = 129636846.

The previous prime is 129636839. The next prime is 129636851. The reversal of 129636847 is 748636921.

It is a strong prime.

It is an emirp because it is prime and its reverse (748636921) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 129636847 - 2³ = 129636839 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 129636797 and 129636806.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129636817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64818423 + 64818424.

It is an arithmetic number, because the mean of its divisors is an integer number (64818424).

Almost surely, 2^129636847 is an apocalyptic number.

129636847 is a deficient number, since it is larger than the sum of its proper divisors (1).

129636847 is an equidigital number, since it uses as much as digits as its factorization.

129636847 is an evil number, because the sum of its binary digits is even.

The product of its digits is 435456, while the sum is 46.

The square root of 129636847 is about 11385.8178011068. The cubic root of 129636847 is about 506.1075544567.

The spelling of 129636847 in words is "one hundred twenty-nine million, six hundred thirty-six thousand, eight hundred forty-seven".