1028591209 has 2 divisors, whose sum is σ = 1028591210. Its totient is φ = 1028591208.

The previous prime is 1028591197. The next prime is 1028591233. The reversal of 1028591209 is 9021958201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 706496400 + 322094809 = 26580^2 + 17947^2 .

It is a cyclic number.

It is not a de Polignac number, because 1028591209 - 2¹¹ = 1028589161 is a prime.

It is not a weakly prime, because it can be changed into another prime (1028591909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 514295604 + 514295605.

It is an arithmetic number, because the mean of its divisors is an integer number (514295605).

Almost surely, 2^1028591209 is an apocalyptic number.

It is an amenable number.

1028591209 is a deficient number, since it is larger than the sum of its proper divisors (1).

1028591209 is an equidigital number, since it uses as much as digits as its factorization.

1028591209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12960, while the sum is 37.

The square root of 1028591209 is about 32071.6574096195. The cubic root of 1028591209 is about 1009.4409902049.

The spelling of 1028591209 in words is "one billion, twenty-eight million, five hundred ninety-one thousand, two hundred nine".