128189641 has 2 divisors, whose sum is σ = 128189642. Its totient is φ = 128189640.

The previous prime is 128189629. The next prime is 128189687. The reversal of 128189641 is 146981821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 125350416 + 2839225 = 11196^2 + 1685^2 .

It is a cyclic number.

It is not a de Polignac number, because 128189641 - 2¹¹ = 128187593 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 128189594 and 128189603.

It is not a weakly prime, because it can be changed into another prime (128189141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64094820 + 64094821.

It is an arithmetic number, because the mean of its divisors is an integer number (64094821).

Almost surely, 2^128189641 is an apocalyptic number.

It is an amenable number.

128189641 is a deficient number, since it is larger than the sum of its proper divisors (1).

128189641 is an equidigital number, since it uses as much as digits as its factorization.

128189641 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27648, while the sum is 40.

The square root of 128189641 is about 11322.0864243301. The cubic root of 128189641 is about 504.2171853604.

The spelling of 128189641 in words is "one hundred twenty-eight million, one hundred eighty-nine thousand, six hundred forty-one".