548969821 has 4 divisors (see below), whose sum is σ = 549045792. Its totient is φ = 548893852.

The previous prime is 548969809. The next prime is 548969833. The reversal of 548969821 is 128969845.

548969821 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (548969809) and next prime (548969833).

It is a cyclic number.

It is not a de Polignac number, because 548969821 - 2¹³ = 548961629 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 (548969801) 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, 25855 + ... + 42028.

It is an arithmetic number, because the mean of its divisors is an integer number (137261448).

Almost surely, 2^548969821 is an apocalyptic number.

It is an amenable number.

548969821 is a deficient number, since it is larger than the sum of its proper divisors (75971).

548969821 is an equidigital number, since it uses as much as digits as its factorization.

548969821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75970.

The product of its digits is 1244160, while the sum is 52.

The square root of 548969821 is about 23430.1050147028. The cubic root of 548969821 is about 818.8094069048.

The spelling of 548969821 in words is "five hundred forty-eight million, nine hundred sixty-nine thousand, eight hundred twenty-one".