128332681 has 2 divisors, whose sum is σ = 128332682. Its totient is φ = 128332680.

The previous prime is 128332679. The next prime is 128332717. The reversal of 128332681 is 186233821.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 102414400 + 25918281 = 10120^2 + 5091^2 .

It is a cyclic number.

It is not a de Polignac number, because 128332681 - 2¹ = 128332679 is a prime.

It is a super-3 number, since 3×128332681³ (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

Together with 128332679, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (128332661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64166340 + 64166341.

It is an arithmetic number, because the mean of its divisors is an integer number (64166341).

Almost surely, 2^128332681 is an apocalyptic number.

It is an amenable number.

128332681 is a deficient number, since it is larger than the sum of its proper divisors (1).

128332681 is an equidigital number, since it uses as much as digits as its factorization.

128332681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13824, while the sum is 34.

The square root of 128332681 is about 11328.4015200733. The cubic root of 128332681 is about 504.4046586905.

The spelling of 128332681 in words is "one hundred twenty-eight million, three hundred thirty-two thousand, six hundred eighty-one".