129281903 has 2 divisors, whose sum is σ = 129281904. Its totient is φ = 129281902.

The previous prime is 129281899. The next prime is 129281953. The reversal of 129281903 is 309182921.

It is a weak prime.

It is an emirp because it is prime and its reverse (309182921) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 129281903 - 2² = 129281899 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129281953) 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, 64640951 + 64640952.

It is an arithmetic number, because the mean of its divisors is an integer number (64640952).

Almost surely, 2^129281903 is an apocalyptic number.

129281903 is a deficient number, since it is larger than the sum of its proper divisors (1).

129281903 is an equidigital number, since it uses as much as digits as its factorization.

129281903 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7776, while the sum is 35.

The square root of 129281903 is about 11370.2200066665. The cubic root of 129281903 is about 505.6452269515.

The spelling of 129281903 in words is "one hundred twenty-nine million, two hundred eighty-one thousand, nine hundred three".