1128289 has 2 divisors, whose sum is σ = 1128290. Its totient is φ = 1128288.

The previous prime is 1128287. The next prime is 1128293. The reversal of 1128289 is 9828211.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1016064 + 112225 = 1008^2 + 335^2 .

It is an emirp because it is prime and its reverse (9828211) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1128289 - 2¹ = 1128287 is a prime.

Together with 1128287, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1128289.

It is not a weakly prime, because it can be changed into another prime (1128287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 564144 + 564145.

It is an arithmetic number, because the mean of its divisors is an integer number (564145).

2^1128289 is an apocalyptic number.

It is an amenable number.

1128289 is a deficient number, since it is larger than the sum of its proper divisors (1).

1128289 is an equidigital number, since it uses as much as digits as its factorization.

1128289 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2304, while the sum is 31.

The square root of 1128289 is about 1062.2094896959. The cubic root of 1128289 is about 104.1054465516.

The spelling of 1128289 in words is "one million, one hundred twenty-eight thousand, two hundred eighty-nine".