129705887 has 2 divisors, whose sum is σ = 129705888. Its totient is φ = 129705886.

The previous prime is 129705883. The next prime is 129705899. The reversal of 129705887 is 788507921.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 129705887 - 2² = 129705883 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129705881) 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, 64852943 + 64852944.

It is an arithmetic number, because the mean of its divisors is an integer number (64852944).

Almost surely, 2^129705887 is an apocalyptic number.

129705887 is a deficient number, since it is larger than the sum of its proper divisors (1).

129705887 is an equidigital number, since it uses as much as digits as its factorization.

129705887 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 282240, while the sum is 47.

The square root of 129705887 is about 11388.8492394974. The cubic root of 129705887 is about 506.1973835068.

The spelling of 129705887 in words is "one hundred twenty-nine million, seven hundred five thousand, eight hundred eighty-seven".