549726809 has 2 divisors, whose sum is σ = 549726810. Its totient is φ = 549726808.

The previous prime is 549726803. The next prime is 549726817. The reversal of 549726809 is 908627945.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 548871184 + 855625 = 23428^2 + 925^2 .

It is a cyclic number.

It is not a de Polignac number, because 549726809 - 2¹² = 549722713 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (549726803) 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, 274863404 + 274863405.

It is an arithmetic number, because the mean of its divisors is an integer number (274863405).

Almost surely, 2^549726809 is an apocalyptic number.

It is an amenable number.

549726809 is a deficient number, since it is larger than the sum of its proper divisors (1).

549726809 is an equidigital number, since it uses as much as digits as its factorization.

549726809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1088640, while the sum is 50.

The square root of 549726809 is about 23446.2536239801. The cubic root of 549726809 is about 819.1855928629.

The spelling of 549726809 in words is "five hundred forty-nine million, seven hundred twenty-six thousand, eight hundred nine".