549091 has 2 divisors, whose sum is σ = 549092. Its totient is φ = 549090.

The previous prime is 549089. The next prime is 549097. The reversal of 549091 is 190945.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 549091 - 2¹ = 549089 is a prime.

Together with 549089, it forms a pair of twin primes.

549091 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (549097) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 274545 + 274546.

It is an arithmetic number, because the mean of its divisors is an integer number (274546).

2⁵⁴⁹⁰⁹¹ is an apocalyptic number.

549091 is a deficient number, since it is larger than the sum of its proper divisors (1).

549091 is an equidigital number, since it uses as much as digits as its factorization.

549091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1620, while the sum is 28.

The square root of 549091 is about 741.0067476076. The cubic root of 549091 is about 81.8869650171.

The spelling of 549091 in words is "five hundred forty-nine thousand, ninety-one".