128158871 has 2 divisors, whose sum is σ = 128158872. Its totient is φ = 128158870.

The previous prime is 128158817. The next prime is 128158879. The reversal of 128158871 is 178851821.

Together with previous prime (128158817) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 128158871 - 2²⁶ = 61050007 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128158879) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64079435 + 64079436.

It is an arithmetic number, because the mean of its divisors is an integer number (64079436).

Almost surely, 2^128158871 is an apocalyptic number.

128158871 is a deficient number, since it is larger than the sum of its proper divisors (1).

128158871 is an equidigital number, since it uses as much as digits as its factorization.

128158871 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 35840, while the sum is 41.

The square root of 128158871 is about 11320.7274942912. The cubic root of 128158871 is about 504.1768388753.

The spelling of 128158871 in words is "one hundred twenty-eight million, one hundred fifty-eight thousand, eight hundred seventy-one".