128225191 has 2 divisors, whose sum is σ = 128225192. Its totient is φ = 128225190.

The previous prime is 128225189. The next prime is 128225213. The reversal of 128225191 is 191522821.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 128225191 - 2¹ = 128225189 is a prime.

Together with 128225189, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128225171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64112595 + 64112596.

It is an arithmetic number, because the mean of its divisors is an integer number (64112596).

Almost surely, 2^128225191 is an apocalyptic number.

128225191 is a deficient number, since it is larger than the sum of its proper divisors (1).

128225191 is an equidigital number, since it uses as much as digits as its factorization.

128225191 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2880, while the sum is 31.

The square root of 128225191 is about 11323.6562558213. The cubic root of 128225191 is about 504.2637914773.

The spelling of 128225191 in words is "one hundred twenty-eight million, two hundred twenty-five thousand, one hundred ninety-one".