281003 has 4 divisors (see below), whose sum is σ = 284640. Its totient is φ = 277368.

The previous prime is 280997. The next prime is 281023. The reversal of 281003 is 300182.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 300182 = 2 ⋅150091.

It is a cyclic number.

It is not a de Polignac number, because 281003 - 2⁶ = 280939 is a prime.

It is a Duffinian number.

It is a plaindrome in base 16.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 281003.

It is not an unprimeable number, because it can be changed into a prime (281023) 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, 1700 + ... + 1857.

It is an arithmetic number, because the mean of its divisors is an integer number (71160).

2²⁸¹⁰⁰³ is an apocalyptic number.

281003 is a deficient number, since it is larger than the sum of its proper divisors (3637).

281003 is an equidigital number, since it uses as much as digits as its factorization.

281003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3636.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 281003 is about 530.0971609054. The cubic root of 281003 is about 65.4993492933.

Adding to 281003 its reverse (300182), we get a palindrome (581185).

The spelling of 281003 in words is "two hundred eighty-one thousand, three".