128491641 has 6 divisors (see below), whose sum is σ = 185599050. Its totient is φ = 85661088.

The previous prime is 128491631. The next prime is 128491651. The reversal of 128491641 is 146194821.

128491641 is a `hidden beast` number, since 1 + 2 + 8 + 4 + 9 + 1 + 641 = 666.

It is an interprime number because it is at equal distance from previous prime (128491631) and next prime (128491651).

It can be written as a sum of positive squares in only one way, i.e., 121881600 + 6610041 = 11040^2 + 2571^2 .

It is not a de Polignac number, because 128491641 - 2⁵ = 128491609 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 128491596 and 128491605.

It is not an unprimeable number, because it can be changed into a prime (128491631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7138416 + ... + 7138433.

It is an arithmetic number, because the mean of its divisors is an integer number (30933175).

Almost surely, 2^128491641 is an apocalyptic number.

It is an amenable number.

128491641 is a deficient number, since it is larger than the sum of its proper divisors (57107409).

128491641 is a wasteful number, since it uses less digits than its factorization.

128491641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14276855 (or 14276852 counting only the distinct ones).

The product of its digits is 13824, while the sum is 36.

The square root of 128491641 is about 11335.4153430741. The cubic root of 128491641 is about 504.6128339879.

The spelling of 128491641 in words is "one hundred twenty-eight million, four hundred ninety-one thousand, six hundred forty-one".