128889589 has 2 divisors, whose sum is σ = 128889590. Its totient is φ = 128889588.

The previous prime is 128889577. The next prime is 128889617. The reversal of 128889589 is 985988821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 104387089 + 24502500 = 10217^2 + 4950^2 .

It is a cyclic number.

It is not a de Polignac number, because 128889589 - 2²⁵ = 95335157 is a prime.

It is a super-2 number, since 2×128889589² = 33225052305177842, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128889989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64444794 + 64444795.

It is an arithmetic number, because the mean of its divisors is an integer number (64444795).

Almost surely, 2^128889589 is an apocalyptic number.

It is an amenable number.

128889589 is a deficient number, since it is larger than the sum of its proper divisors (1).

128889589 is an equidigital number, since it uses as much as digits as its factorization.

128889589 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3317760, while the sum is 58.

The square root of 128889589 is about 11352.9550778641. The cubic root of 128889589 is about 505.1332380522.

The spelling of 128889589 in words is "one hundred twenty-eight million, eight hundred eighty-nine thousand, five hundred eighty-nine".