129276887 has 2 divisors, whose sum is σ = 129276888. Its totient is φ = 129276886.

The previous prime is 129276883. The next prime is 129276937. The reversal of 129276887 is 788672921.

It is an a-pointer prime, because the next prime (129276937) can be obtained adding 129276887 to its sum of digits (50).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 129276887 - 2² = 129276883 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 (129276883) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64638443 + 64638444.

It is an arithmetic number, because the mean of its divisors is an integer number (64638444).

Almost surely, 2^129276887 is an apocalyptic number.

129276887 is a deficient number, since it is larger than the sum of its proper divisors (1).

129276887 is an equidigital number, since it uses as much as digits as its factorization.

129276887 is an evil number, because the sum of its binary digits is even.

The product of its digits is 677376, while the sum is 50.

The square root of 129276887 is about 11369.9994283201. Note that the first 3 decimals coincide. The cubic root of 129276887 is about 505.6386873683.

The spelling of 129276887 in words is "one hundred twenty-nine million, two hundred seventy-six thousand, eight hundred eighty-seven".