128889643 has 2 divisors, whose sum is σ = 128889644. Its totient is φ = 128889642.

The previous prime is 128889641. The next prime is 128889647. The reversal of 128889643 is 346988821.

It is a weak prime.

It is an emirp because it is prime and its reverse (346988821) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 128889643 - 2¹ = 128889641 is a prime.

It is a super-2 number, since 2×128889643² = 33225080145334898, which contains 22 as substring.

Together with 128889641, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (128889641) 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, 64444821 + 64444822.

It is an arithmetic number, because the mean of its divisors is an integer number (64444822).

Almost surely, 2^128889643 is an apocalyptic number.

128889643 is a deficient number, since it is larger than the sum of its proper divisors (1).

128889643 is an equidigital number, since it uses as much as digits as its factorization.

128889643 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 663552, while the sum is 49.

The square root of 128889643 is about 11352.9574560993. The cubic root of 128889643 is about 505.1333085963.

The spelling of 128889643 in words is "one hundred twenty-eight million, eight hundred eighty-nine thousand, six hundred forty-three".