548821 has 16 divisors (see below), whose sum is σ = 697984. Its totient is φ = 419904.

The previous prime is 548791. The next prime is 548827. The reversal of 548821 is 128845.

It is a 4-Lehmer number, since φ(548821) divides (548821-1)⁴.

It is a cyclic number.

It is not a de Polignac number, because 548821 - 2⁷ = 548693 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 548821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (548827) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3286 + ... + 3448.

It is an arithmetic number, because the mean of its divisors is an integer number (43624).

2⁵⁴⁸⁸²¹ is an apocalyptic number.

It is an amenable number.

548821 is a deficient number, since it is larger than the sum of its proper divisors (149163).

548821 is a wasteful number, since it uses less digits than its factorization.

548821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 220.

The product of its digits is 2560, while the sum is 28.

The square root of 548821 is about 740.8245406302. The cubic root of 548821 is about 81.8735409487.

It can be divided in two parts, 548 and 821, that added together give a square (1369 = 37²).

The spelling of 548821 in words is "five hundred forty-eight thousand, eight hundred twenty-one".