2685263209 has 2 divisors, whose sum is σ = 2685263210. Its totient is φ = 2685263208.

The previous prime is 2685263201. The next prime is 2685263279. The reversal of 2685263209 is 9023625862.

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., 2606408809 + 78854400 = 51053^2 + 8880^2 .

It is a cyclic number.

It is not a de Polignac number, because 2685263209 - 2³ = 2685263201 is a prime.

It is not a weakly prime, because it can be changed into another prime (2685263201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1342631604 + 1342631605.

It is an arithmetic number, because the mean of its divisors is an integer number (1342631605).

Almost surely, 2^2685263209 is an apocalyptic number.

It is an amenable number.

2685263209 is a deficient number, since it is larger than the sum of its proper divisors (1).

2685263209 is an equidigital number, since it uses as much as digits as its factorization.

2685263209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 311040, while the sum is 43.

The square root of 2685263209 is about 51819.5253644801. The cubic root of 2685263209 is about 1389.9386148555.

The spelling of 2685263209 in words is "two billion, six hundred eighty-five million, two hundred sixty-three thousand, two hundred nine".