549566 has 4 divisors (see below), whose sum is σ = 824352. Its totient is φ = 274782.

The previous prime is 549553. The next prime is 549569. The reversal of 549566 is 665945.

It is a happy number.

549566 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.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 549566.

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 as a sum of consecutive naturals, namely, 137390 + ... + 137393.

It is an arithmetic number, because the mean of its divisors is an integer number (206088).

2⁵⁴⁹⁵⁶⁶ is an apocalyptic number.

549566 is a deficient number, since it is larger than the sum of its proper divisors (274786).

549566 is a wasteful number, since it uses less digits than its factorization.

549566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 274785.

The product of its digits is 32400, while the sum is 35.

The square root of 549566 is about 741.3271882239. The cubic root of 549566 is about 81.9105707569.

The spelling of 549566 in words is "five hundred forty-nine thousand, five hundred sixty-six".