129275987 has 2 divisors, whose sum is σ = 129275988. Its totient is φ = 129275986.

The previous prime is 129275969. The next prime is 129275989. The reversal of 129275987 is 789572921.

It is a strong prime.

It is an emirp because it is prime and its reverse (789572921) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 129275987 - 2¹⁰ = 129274963 is a prime.

Together with 129275989, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (129275989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64637993 + 64637994.

It is an arithmetic number, because the mean of its divisors is an integer number (64637994).

Almost surely, 2^129275987 is an apocalyptic number.

129275987 is a deficient number, since it is larger than the sum of its proper divisors (1).

129275987 is an equidigital number, since it uses as much as digits as its factorization.

129275987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 635040, while the sum is 50.

The square root of 129275987 is about 11369.9598504128. The cubic root of 129275987 is about 505.6375139802.

The spelling of 129275987 in words is "one hundred twenty-nine million, two hundred seventy-five thousand, nine hundred eighty-seven".