129571987 has 2 divisors, whose sum is σ = 129571988. Its totient is φ = 129571986.

The previous prime is 129571957. The next prime is 129571993. The reversal of 129571987 is 789175921.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 129571987 - 2¹¹ = 129569939 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 129571987.

It is not a weakly prime, because it can be changed into another prime (129571907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64785993 + 64785994.

It is an arithmetic number, because the mean of its divisors is an integer number (64785994).

Almost surely, 2^129571987 is an apocalyptic number.

129571987 is a deficient number, since it is larger than the sum of its proper divisors (1).

129571987 is an equidigital number, since it uses as much as digits as its factorization.

129571987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 317520, while the sum is 49.

The square root of 129571987 is about 11382.9691645019. The cubic root of 129571987 is about 506.0231350116.

The spelling of 129571987 in words is "one hundred twenty-nine million, five hundred seventy-one thousand, nine hundred eighty-seven".