128395481 has 2 divisors, whose sum is σ = 128395482. Its totient is φ = 128395480.

The previous prime is 128395469. The next prime is 128395507. The reversal of 128395481 is 184593821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 116208400 + 12187081 = 10780^2 + 3491^2 .

It is an emirp because it is prime and its reverse (184593821) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128395481 is a prime.

It is a super-2 number, since 2×128395481² = 32970799082442722, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (128398481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64197740 + 64197741.

It is an arithmetic number, because the mean of its divisors is an integer number (64197741).

Almost surely, 2^128395481 is an apocalyptic number.

It is an amenable number.

128395481 is a deficient number, since it is larger than the sum of its proper divisors (1).

128395481 is an equidigital number, since it uses as much as digits as its factorization.

128395481 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 69120, while the sum is 41.

The square root of 128395481 is about 11331.1729754690. The cubic root of 128395481 is about 504.4869226072.

The spelling of 128395481 in words is "one hundred twenty-eight million, three hundred ninety-five thousand, four hundred eighty-one".