549997 has 4 divisors (see below), whose sum is σ = 628576. Its totient is φ = 471420.

The previous prime is 549979. The next prime is 550007. The reversal of 549997 is 799945.

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 549997 - 2¹⁵ = 517229 is a prime.

It is a Duffinian number.

549997 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (549937) 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, 39279 + ... + 39292.

It is an arithmetic number, because the mean of its divisors is an integer number (157144).

2⁵⁴⁹⁹⁹⁷ is an apocalyptic number.

It is an amenable number.

549997 is a deficient number, since it is larger than the sum of its proper divisors (78579).

549997 is an equidigital number, since it uses as much as digits as its factorization.

549997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78578.

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

The square root of 549997 is about 741.6178261072. The cubic root of 549997 is about 81.9319780923.

The spelling of 549997 in words is "five hundred forty-nine thousand, nine hundred ninety-seven".