549123 has 4 divisors (see below), whose sum is σ = 732168. Its totient is φ = 366080.

The previous prime is 549121. The next prime is 549139. The reversal of 549123 is 321945.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 549123 - 2¹ = 549121 is a prime.

It is a D-number.

It is a junction number, because it is equal to n+sod(n) for n = 549093 and 549102.

It is not an unprimeable number, because it can be changed into a prime (549121) 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, 91518 + ... + 91523.

It is an arithmetic number, because the mean of its divisors is an integer number (183042).

2⁵⁴⁹¹²³ is an apocalyptic number.

549123 is a deficient number, since it is larger than the sum of its proper divisors (183045).

549123 is a wasteful number, since it uses less digits than its factorization.

549123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 183044.

The product of its digits is 1080, while the sum is 24.

The square root of 549123 is about 741.0283395390. The cubic root of 549123 is about 81.8885557261. Note that the first 3 decimals are identical.

The spelling of 549123 in words is "five hundred forty-nine thousand, one hundred twenty-three".