549145 has 4 divisors (see below), whose sum is σ = 658980. Its totient is φ = 439312.

The previous prime is 549139. The next prime is 549149. The reversal of 549145 is 541945.

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

It can be written as a sum of positive squares in 2 ways, for example, as 203401 + 345744 = 451^2 + 588^2 .

It is a cyclic number.

It is not a de Polignac number, because 549145 - 2¹¹ = 547097 is a prime.

549145 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (549149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 54910 + ... + 54919.

It is an arithmetic number, because the mean of its divisors is an integer number (164745).

2⁵⁴⁹¹⁴⁵ is an apocalyptic number.

It is an amenable number.

549145 is a deficient number, since it is larger than the sum of its proper divisors (109835).

549145 is a wasteful number, since it uses less digits than its factorization.

549145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109834.

The product of its digits is 3600, while the sum is 28.

The square root of 549145 is about 741.0431836270. The cubic root of 549145 is about 81.8896493027.

Subtracting from 549145 its product of digits (3600), we obtain a palindrome (545545).

The spelling of 549145 in words is "five hundred forty-nine thousand, one hundred forty-five".