2812489209 has 20 divisors (see below), whose sum is σ = 4207697076. Its totient is φ = 1872170496.

The previous prime is 2812489181. The next prime is 2812489213. The reversal of 2812489209 is 9029842182.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 2127515625 + 684973584 = 46125^2 + 26172^2 .

It is not a de Polignac number, because 2812489209 - 2⁹ = 2812488697 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2812489409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 28717 + ... + 80309.

Almost surely, 2^2812489209 is an apocalyptic number.

It is an amenable number.

2812489209 is a deficient number, since it is larger than the sum of its proper divisors (1395207867).

2812489209 is an equidigital number, since it uses as much as digits as its factorization.

2812489209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52278 (or 52269 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 45.

The square root of 2812489209 is about 53032.9068503698. The cubic root of 2812489209 is about 1411.5522380357.

The spelling of 2812489209 in words is "two billion, eight hundred twelve million, four hundred eighty-nine thousand, two hundred nine".