549421 has 2 divisors, whose sum is σ = 549422. Its totient is φ = 549420.

The previous prime is 549403. The next prime is 549431. The reversal of 549421 is 124945.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 346921 + 202500 = 589^2 + 450^2 .

It is a cyclic number.

It is not a de Polignac number, because 549421 - 2⁹ = 548909 is a prime.

It is equal to p₄₅₂₇₇ and since 549421 and 45277 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (549431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 274710 + 274711.

It is an arithmetic number, because the mean of its divisors is an integer number (274711).

2⁵⁴⁹⁴²¹ is an apocalyptic number.

It is an amenable number.

549421 is a deficient number, since it is larger than the sum of its proper divisors (1).

549421 is an equidigital number, since it uses as much as digits as its factorization.

549421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1440, while the sum is 25.

The square root of 549421 is about 741.2293841990. The cubic root of 549421 is about 81.9033662370.

The spelling of 549421 in words is "five hundred forty-nine thousand, four hundred twenty-one".