128346289 has 2 divisors, whose sum is σ = 128346290. Its totient is φ = 128346288.

The previous prime is 128346259. The next prime is 128346313. The reversal of 128346289 is 982643821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 114597025 + 13749264 = 10705^2 + 3708^2 .

It is an emirp because it is prime and its reverse (982643821) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 128346289 - 2⁷ = 128346161 is a prime.

It is not a weakly prime, because it can be changed into another prime (128346259) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64173144 + 64173145.

It is an arithmetic number, because the mean of its divisors is an integer number (64173145).

Almost surely, 2^128346289 is an apocalyptic number.

It is an amenable number.

128346289 is a deficient number, since it is larger than the sum of its proper divisors (1).

128346289 is an equidigital number, since it uses as much as digits as its factorization.

128346289 is an evil number, because the sum of its binary digits is even.

The product of its digits is 165888, while the sum is 43.

The square root of 128346289 is about 11329.0021184569. The cubic root of 128346289 is about 504.4224865629.

The spelling of 128346289 in words is "one hundred twenty-eight million, three hundred forty-six thousand, two hundred eighty-nine".