548221 has 2 divisors, whose sum is σ = 548222. Its totient is φ = 548220.

The previous prime is 548213. The next prime is 548227. The reversal of 548221 is 122845.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 396900 + 151321 = 630^2 + 389^2 .

It is a cyclic number.

It is not a de Polignac number, because 548221 - 2³ = 548213 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 548192 and 548201.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (548227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 274110 + 274111.

It is an arithmetic number, because the mean of its divisors is an integer number (274111).

2⁵⁴⁸²²¹ is an apocalyptic number.

It is an amenable number.

548221 is a deficient number, since it is larger than the sum of its proper divisors (1).

548221 is an equidigital number, since it uses as much as digits as its factorization.

548221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 640, while the sum is 22.

The square root of 548221 is about 740.4194757028. The cubic root of 548221 is about 81.8436939147.

Subtracting from 548221 its product of digits (640), we obtain a triangular number (547581 = T₁₀₄₆).

The spelling of 548221 in words is "five hundred forty-eight thousand, two hundred twenty-one".