549999 has 12 divisors (see below), whose sum is σ = 829296. Its totient is φ = 350592.

The previous prime is 549979. The next prime is 550007. The reversal of 549999 is 999945.

It is a happy number.

549999 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 549999 - 2¹¹ = 547951 is a prime.

549999 is a modest number, since divided by 999 gives 549 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (549949) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1122 + ... + 1535.

It is an arithmetic number, because the mean of its divisors is an integer number (69108).

2⁵⁴⁹⁹⁹⁹ is an apocalyptic number.

549999 is a deficient number, since it is larger than the sum of its proper divisors (279297).

549999 is a wasteful number, since it uses less digits than its factorization.

549999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2686 (or 2683 counting only the distinct ones).

The product of its digits is 131220, while the sum is 45.

The square root of 549999 is about 741.6191745094. The cubic root of 549999 is about 81.9320774042.

The spelling of 549999 in words is "five hundred forty-nine thousand, nine hundred ninety-nine".