128416489 has 2 divisors, whose sum is σ = 128416490. Its totient is φ = 128416488.

The previous prime is 128416481. The next prime is 128416511. The reversal of 128416489 is 984614821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 110944089 + 17472400 = 10533^2 + 4180^2 .

It is an emirp because it is prime and its reverse (984614821) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 128416489 - 2³ = 128416481 is a prime.

It is not a weakly prime, because it can be changed into another prime (128416481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64208244 + 64208245.

It is an arithmetic number, because the mean of its divisors is an integer number (64208245).

Almost surely, 2^128416489 is an apocalyptic number.

It is an amenable number.

128416489 is a deficient number, since it is larger than the sum of its proper divisors (1).

128416489 is an equidigital number, since it uses as much as digits as its factorization.

128416489 is an evil number, because the sum of its binary digits is even.

The product of its digits is 110592, while the sum is 43.

The square root of 128416489 is about 11332.0999377873. The cubic root of 128416489 is about 504.5144357336.

The spelling of 128416489 in words is "one hundred twenty-eight million, four hundred sixteen thousand, four hundred eighty-nine".