128305369 has 2 divisors, whose sum is σ = 128305370. Its totient is φ = 128305368.

The previous prime is 128305363. The next prime is 128305391. The reversal of 128305369 is 963503821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 86211225 + 42094144 = 9285^2 + 6488^2 .

It is a cyclic number.

It is not a de Polignac number, because 128305369 - 2¹¹ = 128303321 is a prime.

It is a super-2 number, since 2×128305369² = 32924535428452322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (128305363) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64152684 + 64152685.

It is an arithmetic number, because the mean of its divisors is an integer number (64152685).

Almost surely, 2^128305369 is an apocalyptic number.

It is an amenable number.

128305369 is a deficient number, since it is larger than the sum of its proper divisors (1).

128305369 is an equidigital number, since it uses as much as digits as its factorization.

128305369 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 38880, while the sum is 37.

The square root of 128305369 is about 11327.1959901822. The cubic root of 128305369 is about 504.3688733723.

The spelling of 128305369 in words is "one hundred twenty-eight million, three hundred five thousand, three hundred sixty-nine".