55003 has 4 divisors (see below), whose sum is σ = 59248. Its totient is φ = 50760.

The previous prime is 55001. The next prime is 55009. The reversal of 55003 is 30055.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 30055 = 5 ⋅6011.

It is a cyclic number.

It is not a de Polignac number, because 55003 - 2¹ = 55001 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13), and also a Moran number because the ratio is a prime number: 4231 = 55003 / (5 + 5 + 0 + 0 + 3).

It is a Duffinian number.

It is a plaindrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (55001) 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 in 3 ways as a sum of consecutive naturals, for example, 2103 + ... + 2128.

It is an arithmetic number, because the mean of its divisors is an integer number (14812).

2⁵⁵⁰⁰³ is an apocalyptic number.

55003 is a deficient number, since it is larger than the sum of its proper divisors (4245).

55003 is a wasteful number, since it uses less digits than its factorization.

55003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4244.

The product of its (nonzero) digits is 75, while the sum is 13.

The square root of 55003 is about 234.5271839254. The cubic root of 55003 is about 38.0302160409.

Adding to 55003 its reverse (30055), we get a palindrome (85058).

The spelling of 55003 in words is "fifty-five thousand, three".