128491579 has 2 divisors, whose sum is σ = 128491580. Its totient is φ = 128491578.

The previous prime is 128491577. The next prime is 128491609. The reversal of 128491579 is 975194821.

It is a weak prime.

It is an emirp because it is prime and its reverse (975194821) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 128491579 - 2¹ = 128491577 is a prime.

Together with 128491577, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (128491577) 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 as a sum of consecutive naturals, namely, 64245789 + 64245790.

It is an arithmetic number, because the mean of its divisors is an integer number (64245790).

Almost surely, 2^128491579 is an apocalyptic number.

128491579 is a deficient number, since it is larger than the sum of its proper divisors (1).

128491579 is an equidigital number, since it uses as much as digits as its factorization.

128491579 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 181440, while the sum is 46.

The square root of 128491579 is about 11335.4126082821. The cubic root of 128491579 is about 504.6127528257.

The spelling of 128491579 in words is "one hundred twenty-eight million, four hundred ninety-one thousand, five hundred seventy-nine".