549784009 has 2 divisors, whose sum is σ = 549784010. Its totient is φ = 549784008.

The previous prime is 549783991. The next prime is 549784021. The reversal of 549784009 is 900487945.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 335805625 + 213978384 = 18325^2 + 14628^2 .

It is a cyclic number.

It is not a de Polignac number, because 549784009 - 2¹⁷ = 549652937 is a prime.

It is a super-2 number, since 2×549784009² = 604524913104224162, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 549784009.

It is not a weakly prime, because it can be changed into another prime (549784099) 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, 274892004 + 274892005.

It is an arithmetic number, because the mean of its divisors is an integer number (274892005).

Almost surely, 2^549784009 is an apocalyptic number.

It is an amenable number.

549784009 is a deficient number, since it is larger than the sum of its proper divisors (1).

549784009 is an equidigital number, since it uses as much as digits as its factorization.

549784009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 362880, while the sum is 46.

The square root of 549784009 is about 23447.4734033328. The cubic root of 549784009 is about 819.2140044242.

The spelling of 549784009 in words is "five hundred forty-nine million, seven hundred eighty-four thousand, nine".