1000001003 has 4 divisors (see below), whose sum is σ = 1000717200. Its totient is φ = 999284808.

The previous prime is 1000000993. The next prime is 1000001011. The reversal of 1000001003 is 3001000001.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1000001003 - 2¹⁴ = 999984619 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1000001053) 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, 356000 + ... + 358797.

It is an arithmetic number, because the mean of its divisors is an integer number (250179300).

Almost surely, 2^1000001003 is an apocalyptic number.

1000001003 is a deficient number, since it is larger than the sum of its proper divisors (716197).

1000001003 is an equidigital number, since it uses as much as digits as its factorization.

1000001003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 716196.

The product of its (nonzero) digits is 3, while the sum is 5.

The square root of 1000001003 is about 31622.7924605023. The cubic root of 1000001003 is about 1000.0003343332. Note that the first 3 decimals are identical.

Adding to 1000001003 its reverse (3001000001), we get a palindrome (4001001004).

The spelling of 1000001003 in words is "one billion, one thousand, three".