128545309 has 2 divisors, whose sum is σ = 128545310. Its totient is φ = 128545308.

The previous prime is 128545301. The next prime is 128545343. The reversal of 128545309 is 903545821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 95160025 + 33385284 = 9755^2 + 5778^2 .

It is an emirp because it is prime and its reverse (903545821) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 128545309 - 2³ = 128545301 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128545301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64272654 + 64272655.

It is an arithmetic number, because the mean of its divisors is an integer number (64272655).

Almost surely, 2^128545309 is an apocalyptic number.

It is an amenable number.

128545309 is a deficient number, since it is larger than the sum of its proper divisors (1).

128545309 is an equidigital number, since it uses as much as digits as its factorization.

128545309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 43200, while the sum is 37.

The square root of 128545309 is about 11337.7823669358. The cubic root of 128545309 is about 504.6830792630.

The spelling of 128545309 in words is "one hundred twenty-eight million, five hundred forty-five thousand, three hundred nine".