549418321 has 4 divisors (see below), whose sum is σ = 549467572. Its totient is φ = 549369072.

The previous prime is 549418283. The next prime is 549418333. The reversal of 549418321 is 123814945.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 228614400 + 320803921 = 15120^2 + 17911^2 .

It is a cyclic number.

It is not a de Polignac number, because 549418321 - 2¹³ = 549410129 is a prime.

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 (549418621) 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, 991 + ... + 33163.

It is an arithmetic number, because the mean of its divisors is an integer number (137366893).

Almost surely, 2^549418321 is an apocalyptic number.

It is an amenable number.

549418321 is a deficient number, since it is larger than the sum of its proper divisors (49251).

549418321 is a wasteful number, since it uses less digits than its factorization.

549418321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49250.

The product of its digits is 34560, while the sum is 37.

The square root of 549418321 is about 23439.6740804986. The cubic root of 549418321 is about 819.0323311540.

The spelling of 549418321 in words is "five hundred forty-nine million, four hundred eighteen thousand, three hundred twenty-one".