549129 has 16 divisors (see below), whose sum is σ = 849920. Its totient is φ = 308880.

The previous prime is 549121. The next prime is 549139. The reversal of 549129 is 921945.

It is a happy number.

It is not a de Polignac number, because 549129 - 2³ = 549121 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 549096 and 549105.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 549129.

It is not an unprimeable number, because it can be changed into a prime (549121) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1494 + ... + 1824.

It is an arithmetic number, because the mean of its divisors is an integer number (53120).

2⁵⁴⁹¹²⁹ is an apocalyptic number.

It is an amenable number.

549129 is a deficient number, since it is larger than the sum of its proper divisors (300791).

549129 is a wasteful number, since it uses less digits than its factorization.

549129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 420.

The product of its digits is 3240, while the sum is 30.

The square root of 549129 is about 741.0323879562. The cubic root of 549129 is about 81.8888539772. Note that the first 4 decimals are identical.

Subtracting 549129 from its reverse (921945), we obtain a triangular number (372816 = T₈₆₃).

The spelling of 549129 in words is "five hundred forty-nine thousand, one hundred twenty-nine".