2001003 has 8 divisors (see below), whose sum is σ = 2704848. Its totient is φ = 1315584.

The previous prime is 2000989. The next prime is 2001037. The reversal of 2001003 is 3001002.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2001003 - 2⁶ = 2000939 is a prime.

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 2000982 and 2001000.

It is not an unprimeable number, because it can be changed into a prime (2001073) 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 7 ways as a sum of consecutive naturals, for example, 4350 + ... + 4787.

It is an arithmetic number, because the mean of its divisors is an integer number (338106).

2^2001003 is an apocalyptic number.

2001003 is a deficient number, since it is larger than the sum of its proper divisors (703845).

2001003 is an equidigital number, since it uses as much as digits as its factorization.

2001003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9213.

The product of its (nonzero) digits is 6, while the sum is 6.

The square root of 2001003 is about 1414.5681319753. The cubic root of 2001003 is about 126.0131631499.

Adding to 2001003 its reverse (3001002), we get a palindrome (5002005).

Subtracting 2001003 from its reverse (3001002), we obtain a palindrome (999999).

The spelling of 2001003 in words is "two million, one thousand, three".