549979 has 2 divisors, whose sum is σ = 549980. Its totient is φ = 549978.

The previous prime is 549977. The next prime is 550007. The reversal of 549979 is 979945.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 549979 - 2¹ = 549977 is a prime.

Together with 549977, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (549977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 274989 + 274990.

It is an arithmetic number, because the mean of its divisors is an integer number (274990).

2⁵⁴⁹⁹⁷⁹ is an apocalyptic number.

549979 is a deficient number, since it is larger than the sum of its proper divisors (1).

549979 is an equidigital number, since it uses as much as digits as its factorization.

549979 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 102060, while the sum is 43.

The square root of 549979 is about 741.6056903773. The cubic root of 549979 is about 81.9310842743.

The spelling of 549979 in words is "five hundred forty-nine thousand, nine hundred seventy-nine".