217005449 has 2 divisors, whose sum is σ = 217005450. Its totient is φ = 217005448.

The previous prime is 217005433. The next prime is 217005461. The reversal of 217005449 is 944500712.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 164660224 + 52345225 = 12832^2 + 7235^2 .

It is a cyclic number.

It is not a de Polignac number, because 217005449 - 2⁴ = 217005433 is a prime.

It is not a weakly prime, because it can be changed into another prime (217005149) 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, 108502724 + 108502725.

It is an arithmetic number, because the mean of its divisors is an integer number (108502725).

Almost surely, 2^217005449 is an apocalyptic number.

It is an amenable number.

217005449 is a deficient number, since it is larger than the sum of its proper divisors (1).

217005449 is an equidigital number, since it uses as much as digits as its factorization.

217005449 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10080, while the sum is 32.

The square root of 217005449 is about 14731.1048126066. The cubic root of 217005449 is about 600.9295305077.

The spelling of 217005449 in words is "two hundred seventeen million, five thousand, four hundred forty-nine".