549181 has 4 divisors (see below), whose sum is σ = 551772. Its totient is φ = 546592.

The previous prime is 549169. The next prime is 549193. The reversal of 549181 is 181945.

It is a happy number.

549181 is an esthetic number in base 11, because in such base its adjacent digits differ by 1.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 181945 = 5 ⋅36389.

It is an interprime number because it is at equal distance from previous prime (549169) and next prime (549193).

It can be written as a sum of positive squares in 2 ways, for example, as 105625 + 443556 = 325^2 + 666^2 .

It is a cyclic number.

It is not a de Polignac number, because 549181 - 2⁵ = 549149 is a prime.

It is a super-2 number, since 2×549181² = 603199541522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

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, 946 + ... + 1411.

It is an arithmetic number, because the mean of its divisors is an integer number (137943).

2⁵⁴⁹¹⁸¹ is an apocalyptic number.

It is an amenable number.

549181 is a deficient number, since it is larger than the sum of its proper divisors (2591).

549181 is a wasteful number, since it uses less digits than its factorization.

549181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2590.

The product of its digits is 1440, while the sum is 28.

The square root of 549181 is about 741.0674733113. The cubic root of 549181 is about 81.8914387286.

Subtracting from 549181 its reverse (181945), we obtain a square (367236 = 606²).

The spelling of 549181 in words is "five hundred forty-nine thousand, one hundred eighty-one".