128547281 has 2 divisors, whose sum is σ = 128547282. Its totient is φ = 128547280.

The previous prime is 128547271. The next prime is 128547301. The reversal of 128547281 is 182745821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 77281681 + 51265600 = 8791^2 + 7160^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128547281 is a prime.

It is a super-2 number, since 2×128547281² = 33048806904985922, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (128547271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64273640 + 64273641.

It is an arithmetic number, because the mean of its divisors is an integer number (64273641).

Almost surely, 2^128547281 is an apocalyptic number.

It is an amenable number.

128547281 is a deficient number, since it is larger than the sum of its proper divisors (1).

128547281 is an equidigital number, since it uses as much as digits as its factorization.

128547281 is an evil number, because the sum of its binary digits is even.

The product of its digits is 35840, while the sum is 38.

The square root of 128547281 is about 11337.8693324628. The cubic root of 128547281 is about 504.6856600130.

The spelling of 128547281 in words is "one hundred twenty-eight million, five hundred forty-seven thousand, two hundred eighty-one".