549109 has 4 divisors (see below), whose sum is σ = 599040. Its totient is φ = 499180.

The previous prime is 549097. The next prime is 549121. The reversal of 549109 is 901945.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (549097) and next prime (549121).

It is not a de Polignac number, because 549109 - 2¹¹ = 547061 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (549139) 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, 24949 + ... + 24970.

It is an arithmetic number, because the mean of its divisors is an integer number (149760).

2⁵⁴⁹¹⁰⁹ is an apocalyptic number.

It is an amenable number.

549109 is a deficient number, since it is larger than the sum of its proper divisors (49931).

549109 is a wasteful number, since it uses less digits than its factorization.

549109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49930.

The product of its (nonzero) digits is 1620, while the sum is 28.

The square root of 549109 is about 741.0188931465. The cubic root of 549109 is about 81.8878597985.

Subtracting from 549109 its sum of digits (28), we obtain a square (549081 = 741²).

Subtracting 549109 from its reverse (901945), we obtain a square (352836 = 594²).

The spelling of 549109 in words is "five hundred forty-nine thousand, one hundred nine".