129681371 has 2 divisors, whose sum is σ = 129681372. Its totient is φ = 129681370.

The previous prime is 129681353. The next prime is 129681397. The reversal of 129681371 is 173186921.

It is a weak prime.

It is an emirp because it is prime and its reverse (173186921) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-129681371 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (129681311) 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, 64840685 + 64840686.

It is an arithmetic number, because the mean of its divisors is an integer number (64840686).

Almost surely, 2^129681371 is an apocalyptic number.

129681371 is a deficient number, since it is larger than the sum of its proper divisors (1).

129681371 is an equidigital number, since it uses as much as digits as its factorization.

129681371 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18144, while the sum is 38.

The square root of 129681371 is about 11387.7728726911. The cubic root of 129681371 is about 506.1654889971.

The spelling of 129681371 in words is "one hundred twenty-nine million, six hundred eighty-one thousand, three hundred seventy-one".