549017021 has 12 divisors (see below), whose sum is σ = 641152188. Its totient is φ = 468744192.

The previous prime is 549016999. The next prime is 549017041. The reversal of 549017021 is 120710945.

It can be written as a sum of positive squares in 2 ways, for example, as 264420121 + 284596900 = 16261^2 + 16870^2 .

It is not a de Polignac number, because 549017021 - 2¹⁴ = 549000637 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 (549017041) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9206 + ... + 34391.

It is an arithmetic number, because the mean of its divisors is an integer number (53429349).

Almost surely, 2^549017021 is an apocalyptic number.

It is an amenable number.

549017021 is a deficient number, since it is larger than the sum of its proper divisors (92135167).

549017021 is a wasteful number, since it uses less digits than its factorization.

549017021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43868 (or 43861 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 29.

The square root of 549017021 is about 23431.1122441936. The cubic root of 549017021 is about 818.8328730985.

Adding to 549017021 its reverse (120710945), we get a palindrome (669727966).

The spelling of 549017021 in words is "five hundred forty-nine million, seventeen thousand, twenty-one".