549565 has 4 divisors (see below), whose sum is σ = 659484. Its totient is φ = 439648.

The previous prime is 549553. The next prime is 549569. The reversal of 549565 is 565945.

It is a happy number.

549565 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: 565945 = 5 ⋅113189.

It can be written as a sum of positive squares in 2 ways, for example, as 182329 + 367236 = 427^2 + 606^2 .

It is a cyclic number.

It is not a de Polignac number, because 549565 - 2⁵ = 549533 is a prime.

It is a Duffinian number.

549565 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 549565.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (549569) 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, 54952 + ... + 54961.

It is an arithmetic number, because the mean of its divisors is an integer number (164871).

2⁵⁴⁹⁵⁶⁵ is an apocalyptic number.

It is an amenable number.

549565 is a deficient number, since it is larger than the sum of its proper divisors (109919).

549565 is a wasteful number, since it uses less digits than its factorization.

549565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109918.

The product of its digits is 27000, while the sum is 34.

The square root of 549565 is about 741.3265137576. The cubic root of 549565 is about 81.9105210749.

The spelling of 549565 in words is "five hundred forty-nine thousand, five hundred sixty-five".