549218891 has 4 divisors (see below), whose sum is σ = 591466512. Its totient is φ = 506971272.

The previous prime is 549218851. The next prime is 549218927. The reversal of 549218891 is 198812945.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 549218891 - 2⁶ = 549218827 is a prime.

It is not an unprimeable number, because it can be changed into a prime (549218851) 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, 21123791 + ... + 21123816.

It is an arithmetic number, because the mean of its divisors is an integer number (147866628).

Almost surely, 2^549218891 is an apocalyptic number.

549218891 is a deficient number, since it is larger than the sum of its proper divisors (42247621).

549218891 is a wasteful number, since it uses less digits than its factorization.

549218891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42247620.

The product of its digits is 207360, while the sum is 47.

The square root of 549218891 is about 23435.4195823331. The cubic root of 549218891 is about 818.9332206471.

The spelling of 549218891 in words is "five hundred forty-nine million, two hundred eighteen thousand, eight hundred ninety-one".