128481134681 has 2 divisors, whose sum is σ = 128481134682. Its totient is φ = 128481134680.

The previous prime is 128481134669. The next prime is 128481134689. The reversal of 128481134681 is 186431184821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 104808235081 + 23672899600 = 323741^2 + 153860^2 .

It is a cyclic number.

It is not a de Polignac number, because 128481134681 - 2³⁴ = 111301265497 is a prime.

It is a super-2 number, since 2×128481134681² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (128481134689) 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, 64240567340 + 64240567341.

It is an arithmetic number, because the mean of its divisors is an integer number (64240567341).

Almost surely, 2^128481134681 is an apocalyptic number.

It is an amenable number.

128481134681 is a deficient number, since it is larger than the sum of its proper divisors (1).

128481134681 is an equidigital number, since it uses as much as digits as its factorization.

128481134681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 294912, while the sum is 47.

The spelling of 128481134681 in words is "one hundred twenty-eight billion, four hundred eighty-one million, one hundred thirty-four thousand, six hundred eighty-one".