128868589 has 2 divisors, whose sum is σ = 128868590. Its totient is φ = 128868588.

The previous prime is 128868587. The next prime is 128868611. The reversal of 128868589 is 985868821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 127306089 + 1562500 = 11283^2 + 1250^2 .

It is a cyclic number.

It is not a de Polignac number, because 128868589 - 2¹ = 128868587 is a prime.

It is a super-2 number, since 2×128868589² = 33214226461701842, which contains 22 as substring.

Together with 128868587, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128868587) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64434294 + 64434295.

It is an arithmetic number, because the mean of its divisors is an integer number (64434295).

Almost surely, 2^128868589 is an apocalyptic number.

It is an amenable number.

128868589 is a deficient number, since it is larger than the sum of its proper divisors (1).

128868589 is an equidigital number, since it uses as much as digits as its factorization.

128868589 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2211840, while the sum is 55.

The square root of 128868589 is about 11352.0301708549. The cubic root of 128868589 is about 505.1058027508.

The spelling of 128868589 in words is "one hundred twenty-eight million, eight hundred sixty-eight thousand, five hundred eighty-nine".