128375281 has 2 divisors, whose sum is σ = 128375282. Its totient is φ = 128375280.

The previous prime is 128375263. The next prime is 128375323. The reversal of 128375281 is 182573821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 84272400 + 44102881 = 9180^2 + 6641^2 .

It is a cyclic number.

It is not a de Polignac number, because 128375281 - 2²³ = 119986673 is a prime.

It is a super-2 number, since 2×128375281² = 32960425543657922, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 128375281.

It is not a weakly prime, because it can be changed into another prime (128375231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64187640 + 64187641.

It is an arithmetic number, because the mean of its divisors is an integer number (64187641).

Almost surely, 2^128375281 is an apocalyptic number.

It is an amenable number.

128375281 is a deficient number, since it is larger than the sum of its proper divisors (1).

128375281 is an equidigital number, since it uses as much as digits as its factorization.

128375281 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 26880, while the sum is 37.

The square root of 128375281 is about 11330.2815940293. The cubic root of 128375281 is about 504.4604648476.

The spelling of 128375281 in words is "one hundred twenty-eight million, three hundred seventy-five thousand, two hundred eighty-one".