705428309 has 2 divisors, whose sum is σ = 705428310. Its totient is φ = 705428308.

The previous prime is 705428293. The next prime is 705428323. The reversal of 705428309 is 903824507.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 686964100 + 18464209 = 26210^2 + 4297^2 .

It is an emirp because it is prime and its reverse (903824507) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 705428309 - 2⁴ = 705428293 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (705428359) 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, 352714154 + 352714155.

It is an arithmetic number, because the mean of its divisors is an integer number (352714155).

Almost surely, 2^705428309 is an apocalyptic number.

It is an amenable number.

705428309 is a deficient number, since it is larger than the sum of its proper divisors (1).

705428309 is an equidigital number, since it uses as much as digits as its factorization.

705428309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 60480, while the sum is 38.

The square root of 705428309 is about 26559.9003951446. The cubic root of 705428309 is about 890.1932455013.

The spelling of 705428309 in words is "seven hundred five million, four hundred twenty-eight thousand, three hundred nine".