5518549 has 2 divisors, whose sum is σ = 5518550. Its totient is φ = 5518548.

The previous prime is 5518547. The next prime is 5518553. The reversal of 5518549 is 9458155.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5489649 + 28900 = 2343^2 + 170^2 .

It is a cyclic number.

It is not a de Polignac number, because 5518549 - 2¹ = 5518547 is a prime.

Together with 5518547, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5518543) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2759274 + 2759275.

It is an arithmetic number, because the mean of its divisors is an integer number (2759275).

Almost surely, 2^5518549 is an apocalyptic number.

It is an amenable number.

5518549 is a deficient number, since it is larger than the sum of its proper divisors (1).

5518549 is an equidigital number, since it uses as much as digits as its factorization.

5518549 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 36000, while the sum is 37.

The square root of 5518549 is about 2349.1592112924. The cubic root of 5518549 is about 176.7156317738.

The spelling of 5518549 in words is "five million, five hundred eighteen thousand, five hundred forty-nine".