549221 has 2 divisors, whose sum is σ = 549222. Its totient is φ = 549220.

The previous prime is 549203. The next prime is 549229. The reversal of 549221 is 122945.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 376996 + 172225 = 614^2 + 415^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-549221 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

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 549221.

It is not a weakly prime, because it can be changed into another prime (549229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 274610 + 274611.

It is an arithmetic number, because the mean of its divisors is an integer number (274611).

2⁵⁴⁹²²¹ is an apocalyptic number.

It is an amenable number.

549221 is a deficient number, since it is larger than the sum of its proper divisors (1).

549221 is an equidigital number, since it uses as much as digits as its factorization.

549221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 720, while the sum is 23.

The square root of 549221 is about 741.0944609157. The cubic root of 549221 is about 81.8934268880.

The spelling of 549221 in words is "five hundred forty-nine thousand, two hundred twenty-one".