128976889 has 2 divisors, whose sum is σ = 128976890. Its totient is φ = 128976888.

The previous prime is 128976829. The next prime is 128976919. The reversal of 128976889 is 988679821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 75394489 + 53582400 = 8683^2 + 7320^2 .

It is an emirp because it is prime and its reverse (988679821) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 128976889 - 2¹¹ = 128974841 is a prime.

It is a super-2 number, since 2×128976889² = 33270075792236642, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (128976829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64488444 + 64488445.

It is an arithmetic number, because the mean of its divisors is an integer number (64488445).

Almost surely, 2^128976889 is an apocalyptic number.

It is an amenable number.

128976889 is a deficient number, since it is larger than the sum of its proper divisors (1).

128976889 is an equidigital number, since it uses as much as digits as its factorization.

128976889 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3483648, while the sum is 58.

The square root of 128976889 is about 11356.7992409834. The cubic root of 128976889 is about 505.2472585859.

The spelling of 128976889 in words is "one hundred twenty-eight million, nine hundred seventy-six thousand, eight hundred eighty-nine".