549481409 has 4 divisors (see below), whose sum is σ = 550044804. Its totient is φ = 548918016.

The previous prime is 549481397. The next prime is 549481423. The reversal of 549481409 is 904184945.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 904184945 = 5 ⋅180836989.

It can be written as a sum of positive squares in 2 ways, for example, as 479391025 + 70090384 = 21895^2 + 8372^2 .

It is a cyclic number.

It is not a de Polignac number, because 549481409 - 2⁴ = 549481393 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 549481409.

It is not an unprimeable number, because it can be changed into a prime (549481459) 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 in 3 ways as a sum of consecutive naturals, for example, 280232 + ... + 282185.

It is an arithmetic number, because the mean of its divisors is an integer number (137511201).

Almost surely, 2^549481409 is an apocalyptic number.

It is an amenable number.

549481409 is a deficient number, since it is larger than the sum of its proper divisors (563395).

549481409 is an equidigital number, since it uses as much as digits as its factorization.

549481409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 563394.

The product of its (nonzero) digits is 207360, while the sum is 44.

The square root of 549481409 is about 23441.0197943690. The cubic root of 549481409 is about 819.0636789341.

The spelling of 549481409 in words is "five hundred forty-nine million, four hundred eighty-one thousand, four hundred nine".