5545 has 4 divisors (see below), whose sum is σ = 6660. Its totient is φ = 4432.

The previous prime is 5531. The next prime is 5557. The reversal of 5545 is 5455.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5455 = 5 ⋅1091.

It can be written as a sum of positive squares in 2 ways, for example, as 784 + 4761 = 28^2 + 69^2 .

It is a cyclic number.

It is not a de Polignac number, because 5545 - 2⁷ = 5417 is a prime.

It is a plaindrome in base 15.

It is a nialpdrome in base 7 and base 9.

It is a zygodrome in base 7.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 550 + ... + 559.

It is an arithmetic number, because the mean of its divisors is an integer number (1665).

2⁵⁵⁴⁵ is an apocalyptic number.

It is an amenable number.

5545 is a deficient number, since it is larger than the sum of its proper divisors (1115).

5545 is a wasteful number, since it uses less digits than its factorization.

5545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1114.

The product of its digits is 500, while the sum is 19.

The square root of 5545 is about 74.4647567645. The cubic root of 5545 is about 17.6997520899.

It can be divided in two parts, 55 and 45, that added together give a square (100 = 10²).

The spelling of 5545 in words is "five thousand, five hundred forty-five".