128808569 has 2 divisors, whose sum is σ = 128808570. Its totient is φ = 128808568.

The previous prime is 128808551. The next prime is 128808599. The reversal of 128808569 is 965808821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 106605625 + 22202944 = 10325^2 + 4712^2 .

It is an emirp because it is prime and its reverse (965808821) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 128808569 - 2¹⁶ = 128743033 is a prime.

It is a super-2 number, since 2×128808569² = 33183294895655522, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (128808509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64404284 + 64404285.

It is an arithmetic number, because the mean of its divisors is an integer number (64404285).

Almost surely, 2^128808569 is an apocalyptic number.

It is an amenable number.

128808569 is a deficient number, since it is larger than the sum of its proper divisors (1).

128808569 is an equidigital number, since it uses as much as digits as its factorization.

128808569 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 276480, while the sum is 47.

The square root of 128808569 is about 11349.3862829670. The cubic root of 128808569 is about 505.0273736101.

The spelling of 128808569 in words is "one hundred twenty-eight million, eight hundred eight thousand, five hundred sixty-nine".