128308241 has 2 divisors, whose sum is σ = 128308242. Its totient is φ = 128308240.

The previous prime is 128308199. The next prime is 128308247. The reversal of 128308241 is 142803821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 71757841 + 56550400 = 8471^2 + 7520^2 .

It is an emirp because it is prime and its reverse (142803821) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 128308241 - 2²⁶ = 61199377 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (128308247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64154120 + 64154121.

It is an arithmetic number, because the mean of its divisors is an integer number (64154121).

Almost surely, 2^128308241 is an apocalyptic number.

It is an amenable number.

128308241 is a deficient number, since it is larger than the sum of its proper divisors (1).

128308241 is an equidigital number, since it uses as much as digits as its factorization.

128308241 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3072, while the sum is 29.

The square root of 128308241 is about 11327.3227640074. The cubic root of 128308241 is about 504.3726366251.

The spelling of 128308241 in words is "one hundred twenty-eight million, three hundred eight thousand, two hundred forty-one".