549537409 has 4 divisors (see below), whose sum is σ = 549600516. Its totient is φ = 549474304.

The previous prime is 549537389. The next prime is 549537433. The reversal of 549537409 is 904735945.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 904735945 = 5 ⋅180947189.

It can be written as a sum of positive squares in 2 ways, for example, as 291453184 + 258084225 = 17072^2 + 16065^2 .

It is a cyclic number.

It is not a de Polignac number, because 549537409 - 2⁷ = 549537281 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (549535409) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15904 + ... + 36769.

It is an arithmetic number, because the mean of its divisors is an integer number (137400129).

Almost surely, 2^549537409 is an apocalyptic number.

It is an amenable number.

549537409 is a deficient number, since it is larger than the sum of its proper divisors (63107).

549537409 is a wasteful number, since it uses less digits than its factorization.

549537409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63106.

The product of its (nonzero) digits is 680400, while the sum is 46.

The square root of 549537409 is about 23442.2142512178. The cubic root of 549537409 is about 819.0915027496.

The spelling of 549537409 in words is "five hundred forty-nine million, five hundred thirty-seven thousand, four hundred nine".