305680709 has 2 divisors, whose sum is σ = 305680710. Its totient is φ = 305680708.

The previous prime is 305680691. The next prime is 305680751. The reversal of 305680709 is 907086503.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 157377025 + 148303684 = 12545^2 + 12178^2 .

It is a cyclic number.

It is not a de Polignac number, because 305680709 - 2¹⁶ = 305615173 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (305680769) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 152840354 + 152840355.

It is an arithmetic number, because the mean of its divisors is an integer number (152840355).

Almost surely, 2^305680709 is an apocalyptic number.

It is an amenable number.

305680709 is a deficient number, since it is larger than the sum of its proper divisors (1).

305680709 is an equidigital number, since it uses as much as digits as its factorization.

305680709 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 45360, while the sum is 38.

The square root of 305680709 is about 17483.7269768205. The cubic root of 305680709 is about 673.6319499952.

The spelling of 305680709 in words is "three hundred five million, six hundred eighty thousand, seven hundred nine".