128382011 has 4 divisors (see below), whose sum is σ = 135933912. Its totient is φ = 120830112.

The previous prime is 128381999. The next prime is 128382013. The reversal of 128382011 is 110283821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 110283821 = 397 ⋅277793.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128382011 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128382013) 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 in 3 ways as a sum of consecutive naturals, for example, 3775925 + ... + 3775958.

It is an arithmetic number, because the mean of its divisors is an integer number (33983478).

Almost surely, 2^128382011 is an apocalyptic number.

128382011 is a deficient number, since it is larger than the sum of its proper divisors (7551901).

128382011 is an equidigital number, since it uses as much as digits as its factorization.

128382011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7551900.

The product of its (nonzero) digits is 768, while the sum is 26.

The square root of 128382011 is about 11330.5785818730. The cubic root of 128382011 is about 504.4692800432.

The spelling of 128382011 in words is "one hundred twenty-eight million, three hundred eighty-two thousand, eleven".