549998321 has 2 divisors, whose sum is σ = 549998322. Its totient is φ = 549998320.

The previous prime is 549998261. The next prime is 549998363. The reversal of 549998321 is 123899945.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 436810000 + 113188321 = 20900^2 + 10639^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-549998321 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 549998321.

It is not a weakly prime, because it can be changed into another prime (549998381) 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 as a sum of consecutive naturals, namely, 274999160 + 274999161.

It is an arithmetic number, because the mean of its divisors is an integer number (274999161).

Almost surely, 2^549998321 is an apocalyptic number.

It is an amenable number.

549998321 is a deficient number, since it is larger than the sum of its proper divisors (1).

549998321 is an equidigital number, since it uses as much as digits as its factorization.

549998321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 699840, while the sum is 50.

The square root of 549998321 is about 23452.0430026896. The cubic root of 549998321 is about 819.3204368783.

The spelling of 549998321 in words is "five hundred forty-nine million, nine hundred ninety-eight thousand, three hundred twenty-one".