705813209 has 2 divisors, whose sum is σ = 705813210. Its totient is φ = 705813208.

The previous prime is 705813179. The next prime is 705813217. The reversal of 705813209 is 902318507.

705813209 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 653569225 + 52243984 = 25565^2 + 7228^2 .

It is a cyclic number.

It is not a de Polignac number, because 705813209 - 2¹² = 705809113 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (705818209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 352906604 + 352906605.

It is an arithmetic number, because the mean of its divisors is an integer number (352906605).

Almost surely, 2^705813209 is an apocalyptic number.

It is an amenable number.

705813209 is a deficient number, since it is larger than the sum of its proper divisors (1).

705813209 is an equidigital number, since it uses as much as digits as its factorization.

705813209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15120, while the sum is 35.

The square root of 705813209 is about 26567.1452926354. The cubic root of 705813209 is about 890.3551202460.

The spelling of 705813209 in words is "seven hundred five million, eight hundred thirteen thousand, two hundred nine".