548288821 has 4 divisors (see below), whose sum is σ = 548613612. Its totient is φ = 547964032.

The previous prime is 548288809. The next prime is 548288831. The reversal of 548288821 is 128882845.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 302238225 + 246050596 = 17385^2 + 15686^2 .

It is a cyclic number.

It is not a de Polignac number, because 548288821 - 2¹⁹ = 547764533 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (548288831) 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, 159850 + ... + 163243.

It is an arithmetic number, because the mean of its divisors is an integer number (137153403).

Almost surely, 2^548288821 is an apocalyptic number.

It is an amenable number.

548288821 is a deficient number, since it is larger than the sum of its proper divisors (324791).

548288821 is a wasteful number, since it uses less digits than its factorization.

548288821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 324790.

The product of its digits is 327680, while the sum is 46.

The square root of 548288821 is about 23415.5679196555. The cubic root of 548288821 is about 818.4706876552.

The spelling of 548288821 in words is "five hundred forty-eight million, two hundred eighty-eight thousand, eight hundred twenty-one".