2605340209 has 2 divisors, whose sum is σ = 2605340210. Its totient is φ = 2605340208.

The previous prime is 2605340189. The next prime is 2605340233. The reversal of 2605340209 is 9020435062.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2291058225 + 314281984 = 47865^2 + 17728^2 .

It is a cyclic number.

It is not a de Polignac number, because 2605340209 - 2¹¹ = 2605338161 is a prime.

It is not a weakly prime, because it can be changed into another prime (2605340279) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1302670104 + 1302670105.

It is an arithmetic number, because the mean of its divisors is an integer number (1302670105).

Almost surely, 2^2605340209 is an apocalyptic number.

It is an amenable number.

2605340209 is a deficient number, since it is larger than the sum of its proper divisors (1).

2605340209 is an equidigital number, since it uses as much as digits as its factorization.

2605340209 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 31.

The square root of 2605340209 is about 51042.5333325061. The cubic root of 2605340209 is about 1376.0096534119.

The spelling of 2605340209 in words is "two billion, six hundred five million, three hundred forty thousand, two hundred nine".