549811 has 4 divisors (see below), whose sum is σ = 568800. Its totient is φ = 530824.

The previous prime is 549767. The next prime is 549817. The reversal of 549811 is 118945.

It is a happy number.

549811 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 118945 = 5 ⋅23789.

It is a cyclic number.

It is not a de Polignac number, because 549811 - 2⁷ = 549683 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 549811.

It is not an unprimeable number, because it can be changed into a prime (549817) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9451 + ... + 9508.

It is an arithmetic number, because the mean of its divisors is an integer number (142200).

2⁵⁴⁹⁸¹¹ is an apocalyptic number.

549811 is a deficient number, since it is larger than the sum of its proper divisors (18989).

549811 is a wasteful number, since it uses less digits than its factorization.

549811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18988.

The product of its digits is 1440, while the sum is 28.

The square root of 549811 is about 741.4924139868. The cubic root of 549811 is about 81.9227410321.

The spelling of 549811 in words is "five hundred forty-nine thousand, eight hundred eleven".