7273218209 has 2 divisors, whose sum is σ = 7273218210. Its totient is φ = 7273218208.

The previous prime is 7273218193. The next prime is 7273218223. The reversal of 7273218209 is 9028123727.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6752237584 + 520980625 = 82172^2 + 22825^2 .

It is a cyclic number.

It is not a de Polignac number, because 7273218209 - 2⁴ = 7273218193 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (7273218269) 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, 3636609104 + 3636609105.

It is an arithmetic number, because the mean of its divisors is an integer number (3636609105).

Almost surely, 2^7273218209 is an apocalyptic number.

It is an amenable number.

7273218209 is a deficient number, since it is larger than the sum of its proper divisors (1).

7273218209 is an equidigital number, since it uses as much as digits as its factorization.

7273218209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 84672, while the sum is 41.

The square root of 7273218209 is about 85283.1648627090. The cubic root of 7273218209 is about 1937.5022065545.

The spelling of 7273218209 in words is "seven billion, two hundred seventy-three million, two hundred eighteen thousand, two hundred nine".