548921 has 4 divisors (see below), whose sum is σ = 559332. Its totient is φ = 538512.

The previous prime is 548909. The next prime is 548927. The reversal of 548921 is 129845.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 129845 = 5 ⋅25969.

It can be written as a sum of positive squares in 2 ways, for example, as 336400 + 212521 = 580^2 + 461^2 .

It is a cyclic number.

It is not a de Polignac number, because 548921 - 2¹⁴ = 532537 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (548927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5126 + ... + 5231.

It is an arithmetic number, because the mean of its divisors is an integer number (139833).

2⁵⁴⁸⁹²¹ is an apocalyptic number.

It is an amenable number.

548921 is a deficient number, since it is larger than the sum of its proper divisors (10411).

548921 is a wasteful number, since it uses less digits than its factorization.

548921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10410.

The product of its digits is 2880, while the sum is 29.

The square root of 548921 is about 740.8920299207. The cubic root of 548921 is about 81.8785133391.

The spelling of 548921 in words is "five hundred forty-eight thousand, nine hundred twenty-one".