549870169 has 4 divisors (see below), whose sum is σ = 551073844. Its totient is φ = 548666496.

The previous prime is 549870161. The next prime is 549870193. The reversal of 549870169 is 961078945.

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 212780569 + 337089600 = 14587^2 + 18360^2 .

It is a cyclic number.

It is not a de Polignac number, because 549870169 - 2³ = 549870161 is a prime.

It is a super-2 number, since 2×549870169² = 604714405512177122, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (549870161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 601152 + ... + 602065.

It is an arithmetic number, because the mean of its divisors is an integer number (137768461).

Almost surely, 2^549870169 is an apocalyptic number.

It is an amenable number.

549870169 is a deficient number, since it is larger than the sum of its proper divisors (1203675).

549870169 is a wasteful number, since it uses less digits than its factorization.

549870169 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1203674.

The product of its (nonzero) digits is 544320, while the sum is 49.

The square root of 549870169 is about 23449.3106295260. The cubic root of 549870169 is about 819.2567968606.

The spelling of 549870169 in words is "five hundred forty-nine million, eight hundred seventy thousand, one hundred sixty-nine".