128542871 has 2 divisors, whose sum is σ = 128542872. Its totient is φ = 128542870.

The previous prime is 128542829. The next prime is 128542907. The reversal of 128542871 is 178245821.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 128542871 - 2⁶ = 128542807 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128547871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64271435 + 64271436.

It is an arithmetic number, because the mean of its divisors is an integer number (64271436).

Almost surely, 2^128542871 is an apocalyptic number.

128542871 is a deficient number, since it is larger than the sum of its proper divisors (1).

128542871 is an equidigital number, since it uses as much as digits as its factorization.

128542871 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 35840, while the sum is 38.

The square root of 128542871 is about 11337.6748498094. The cubic root of 128542871 is about 504.6798886237.

The spelling of 128542871 in words is "one hundred twenty-eight million, five hundred forty-two thousand, eight hundred seventy-one".