1128209 has 2 divisors, whose sum is σ = 1128210. Its totient is φ = 1128208.

The previous prime is 1128181. The next prime is 1128223. The reversal of 1128209 is 9028211.

1128209 is nontrivially palindromic in base 4.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 801025 + 327184 = 895^2 + 572^2 .

It is a cyclic number.

It is not a de Polignac number, because 1128209 - 2¹² = 1124113 is a prime.

It is not a weakly prime, because it can be changed into another prime (1128289) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 564104 + 564105.

It is an arithmetic number, because the mean of its divisors is an integer number (564105).

2^1128209 is an apocalyptic number.

It is an amenable number.

1128209 is a deficient number, since it is larger than the sum of its proper divisors (1).

1128209 is an equidigital number, since it uses as much as digits as its factorization.

1128209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 23.

The square root of 1128209 is about 1062.1718316732. The cubic root of 1128209 is about 104.1029860022.

The spelling of 1128209 in words is "one million, one hundred twenty-eight thousand, two hundred nine".