549391 has 2 divisors, whose sum is σ = 549392. Its totient is φ = 549390.

The previous prime is 549379. The next prime is 549403. The reversal of 549391 is 193945.

It is a balanced prime because it is at equal distance from previous prime (549379) and next prime (549403).

It is a cyclic number.

It is not a de Polignac number, because 549391 - 2¹⁵ = 516623 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (549331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 274695 + 274696.

It is an arithmetic number, because the mean of its divisors is an integer number (274696).

2⁵⁴⁹³⁹¹ is an apocalyptic number.

549391 is a deficient number, since it is larger than the sum of its proper divisors (1).

549391 is an equidigital number, since it uses as much as digits as its factorization.

549391 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4860, while the sum is 31.

The square root of 549391 is about 741.2091472722. The cubic root of 549391 is about 81.9018754885.

The spelling of 549391 in words is "five hundred forty-nine thousand, three hundred ninety-one".