128436871 has 2 divisors, whose sum is σ = 128436872. Its totient is φ = 128436870.

The previous prime is 128436851. The next prime is 128436877. The reversal of 128436871 is 178634821.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 128436871 - 2²³ = 120048263 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128436877) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64218435 + 64218436.

It is an arithmetic number, because the mean of its divisors is an integer number (64218436).

Almost surely, 2^128436871 is an apocalyptic number.

128436871 is a deficient number, since it is larger than the sum of its proper divisors (1).

128436871 is an equidigital number, since it uses as much as digits as its factorization.

128436871 is an evil number, because the sum of its binary digits is even.

The product of its digits is 64512, while the sum is 40.

The square root of 128436871 is about 11332.9992058590. Note that the first 3 decimals coincide. The cubic root of 128436871 is about 504.5411261515.

The spelling of 128436871 in words is "one hundred twenty-eight million, four hundred thirty-six thousand, eight hundred seventy-one".