128127971 has 2 divisors, whose sum is σ = 128127972. Its totient is φ = 128127970.

The previous prime is 128127907. The next prime is 128127973. The reversal of 128127971 is 179721821.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 128127971 - 2⁶ = 128127907 is a prime.

Together with 128127973, 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 (128127973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64063985 + 64063986.

It is an arithmetic number, because the mean of its divisors is an integer number (64063986).

Almost surely, 2^128127971 is an apocalyptic number.

128127971 is a deficient number, since it is larger than the sum of its proper divisors (1).

128127971 is an equidigital number, since it uses as much as digits as its factorization.

128127971 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14112, while the sum is 38.

The square root of 128127971 is about 11319.3626587366. The cubic root of 128127971 is about 504.1363154311.

The spelling of 128127971 in words is "one hundred twenty-eight million, one hundred twenty-seven thousand, nine hundred seventy-one".