305212109 has 2 divisors, whose sum is σ = 305212110. Its totient is φ = 305212108.

The previous prime is 305212091. The next prime is 305212147. The reversal of 305212109 is 901212503.

Together with previous prime (305212091) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 199430884 + 105781225 = 14122^2 + 10285^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-305212109 is a prime.

It is a Chen prime.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (305212199) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 152606054 + 152606055.

It is an arithmetic number, because the mean of its divisors is an integer number (152606055).

Almost surely, 2^305212109 is an apocalyptic number.

It is an amenable number.

305212109 is a deficient number, since it is larger than the sum of its proper divisors (1).

305212109 is an equidigital number, since it uses as much as digits as its factorization.

305212109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 540, while the sum is 23.

The square root of 305212109 is about 17470.3208041524. The cubic root of 305212109 is about 673.2875542894.

The spelling of 305212109 in words is "three hundred five million, two hundred twelve thousand, one hundred nine".