5611 has 4 divisors (see below), whose sum is σ = 5824. Its totient is φ = 5400.

The previous prime is 5591. The next prime is 5623. The reversal of 5611 is 1165.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1165 = 5 ⋅233.

It is a 3-Lehmer number, since φ(5611) divides (5611-1)³.

It is a cyclic number.

It is not a de Polignac number, because 5611 - 2⁷ = 5483 is a prime.

It is a Duffinian number.

It is a plaindrome in base 7.

It is a junction number, because it is equal to n+sod(n) for n = 5591 and 5600.

It is not an unprimeable number, because it can be changed into a prime (5641) 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, 60 + ... + 121.

It is an arithmetic number, because the mean of its divisors is an integer number (1456).

2⁵⁶¹¹ is an apocalyptic number.

5611 is the 34-th centered decagonal number.

5611 is a deficient number, since it is larger than the sum of its proper divisors (213).

5611 is a wasteful number, since it uses less digits than its factorization.

5611 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 212.

The product of its digits is 30, while the sum is 13.

The square root of 5611 is about 74.9066085202. The cubic root of 5611 is about 17.7696997443.

Adding to 5611 its reverse (1165), we get a palindrome (6776).

It can be divided in two parts, 56 and 11, that multiplied together give a palindrome (616).

The spelling of 5611 in words is "five thousand, six hundred eleven".