549118921 has 32 divisors (see below), whose sum is σ = 642908448. Its totient is φ = 464486400.

The previous prime is 549118883. The next prime is 549118931. The reversal of 549118921 is 129811945.

549118921 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 16 ways, for example, as 29278921 + 519840000 = 5411^2 + 22800^2 .

It is a 5-Lehmer number, since φ(549118921) divides (549118921-1)⁵.

It is a cyclic number.

It is not a de Polignac number, because 549118921 - 2¹¹ = 549116873 is a prime.

It is not an unprimeable number, because it can be changed into a prime (549118931) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1629265 + ... + 1629601.

It is an arithmetic number, because the mean of its divisors is an integer number (20090889).

Almost surely, 2^549118921 is an apocalyptic number.

It is an amenable number.

549118921 is a deficient number, since it is larger than the sum of its proper divisors (93789527).

549118921 is a wasteful number, since it uses less digits than its factorization.

549118921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 541.

The product of its digits is 25920, while the sum is 40.

The square root of 549118921 is about 23433.2866026087. The cubic root of 549118921 is about 818.8835296385.

The spelling of 549118921 in words is "five hundred forty-nine million, one hundred eighteen thousand, nine hundred twenty-one".