5518813 has 4 divisors (see below), whose sum is σ = 5524668. Its totient is φ = 5512960.

The previous prime is 5518687. The next prime is 5518817. The reversal of 5518813 is 3188155.

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.

It can be written as a sum of positive squares in 2 ways, for example, as 5184729 + 334084 = 2277^2 + 578^2 .

It is a cyclic number.

It is not a de Polignac number, because 5518813 - 2⁹ = 5518301 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

5518813 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5518817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1156 + ... + 3517.

It is an arithmetic number, because the mean of its divisors is an integer number (1381167).

Almost surely, 2^5518813 is an apocalyptic number.

It is an amenable number.

5518813 is a deficient number, since it is larger than the sum of its proper divisors (5855).

5518813 is a wasteful number, since it uses less digits than its factorization.

5518813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5854.

The product of its digits is 4800, while the sum is 31.

The square root of 5518813 is about 2349.2154009371. The cubic root of 5518813 is about 176.7184496754.

The spelling of 5518813 in words is "five million, five hundred eighteen thousand, eight hundred thirteen".