217325784349 has 2 divisors, whose sum is σ = 217325784350. Its totient is φ = 217325784348.

The previous prime is 217325784329. The next prime is 217325784353. The reversal of 217325784349 is 943487523712.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 148691216025 + 68634568324 = 385605^2 + 261982^2 .

It is a cyclic number.

It is not a de Polignac number, because 217325784349 - 2⁹ = 217325783837 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 217325784349.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (217325784329) 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, 108662892174 + 108662892175.

It is an arithmetic number, because the mean of its divisors is an integer number (108662892175).

Almost surely, 2^217325784349 is an apocalyptic number.

It is an amenable number.

217325784349 is a deficient number, since it is larger than the sum of its proper divisors (1).

217325784349 is an equidigital number, since it uses as much as digits as its factorization.

217325784349 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10160640, while the sum is 55.

The spelling of 217325784349 in words is "two hundred seventeen billion, three hundred twenty-five million, seven hundred eighty-four thousand, three hundred forty-nine".