549549891 has 24 divisors (see below), whose sum is σ = 867253296. Its totient is φ = 332562240.

The previous prime is 549549887. The next prime is 549549893. The reversal of 549549891 is 198945945.

549549891 is a `hidden beast` number, since 5 + 4 + 9 + 549 + 8 + 91 = 666.

It is not a de Polignac number, because 549549891 - 2² = 549549887 is a prime.

It is a super-2 number, since 2×549549891² = 604010165396223762, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (549549893) 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 23 ways as a sum of consecutive naturals, for example, 68781 + ... + 76353.

It is an arithmetic number, because the mean of its divisors is an integer number (36135554).

Almost surely, 2^549549891 is an apocalyptic number.

549549891 is a deficient number, since it is larger than the sum of its proper divisors (317703405).

549549891 is a wasteful number, since it uses less digits than its factorization.

549549891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8323 (or 8320 counting only the distinct ones).

The product of its digits is 2332800, while the sum is 54.

The square root of 549549891 is about 23442.4804788231. The cubic root of 549549891 is about 819.0977042217.

The spelling of 549549891 in words is "five hundred forty-nine million, five hundred forty-nine thousand, eight hundred ninety-one".