549381813 has 4 divisors (see below), whose sum is σ = 732509088. Its totient is φ = 366254540.

The previous prime is 549381797. The next prime is 549381823. The reversal of 549381813 is 318183945.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 549381813 - 2⁴ = 549381797 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (549381823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 91563633 + ... + 91563638.

It is an arithmetic number, because the mean of its divisors is an integer number (183127272).

Almost surely, 2^549381813 is an apocalyptic number.

It is an amenable number.

549381813 is a deficient number, since it is larger than the sum of its proper divisors (183127275).

549381813 is a wasteful number, since it uses less digits than its factorization.

549381813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 183127274.

The product of its digits is 103680, while the sum is 42.

The square root of 549381813 is about 23438.8953024668. The cubic root of 549381813 is about 819.0141896072.

The spelling of 549381813 in words is "five hundred forty-nine million, three hundred eighty-one thousand, eight hundred thirteen".