5618 has 6 divisors (see below), whose sum is σ = 8589. Its totient is φ = 2756.

The previous prime is 5591. The next prime is 5623. The reversal of 5618 is 8165.

It can be written as a sum of positive squares in 2 ways, for example, as 5329 + 289 = 73^2 + 17^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=53.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a plaindrome in base 7.

It is a nialpdrome in base 9.

It is a zygodrome in base 7.

It is a self number, because there is not a number n which added to its sum of digits gives 5618.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 80 + ... + 132.

2⁵⁶¹⁸ is an apocalyptic number.

5618 is a deficient number, since it is larger than the sum of its proper divisors (2971).

5618 is an equidigital number, since it uses as much as digits as its factorization.

5618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108 (or 55 counting only the distinct ones).

The product of its digits is 240, while the sum is 20.

The square root of 5618 is about 74.9533188058. The cubic root of 5618 is about 17.7770861999. Note that the first 3 decimals are identical.

The spelling of 5618 in words is "five thousand, six hundred eighteen".