549961 has 4 divisors (see below), whose sum is σ = 552132. Its totient is φ = 547792.

The previous prime is 549949. The next prime is 549977. The reversal of 549961 is 169945.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 447561 + 102400 = 669^2 + 320^2 .

It is a cyclic number.

It is not a de Polignac number, because 549961 - 2⁷ = 549833 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (549911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 646 + ... + 1231.

It is an arithmetic number, because the mean of its divisors is an integer number (138033).

2⁵⁴⁹⁹⁶¹ is an apocalyptic number.

It is an amenable number.

549961 is a deficient number, since it is larger than the sum of its proper divisors (2171).

549961 is a wasteful number, since it uses less digits than its factorization.

549961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2170.

The product of its digits is 9720, while the sum is 34.

The square root of 549961 is about 741.5935544488. The cubic root of 549961 is about 81.9301904367.

The spelling of 549961 in words is "five hundred forty-nine thousand, nine hundred sixty-one".