1001320003 has 4 divisors (see below), whose sum is σ = 1001386048. Its totient is φ = 1001253960.

The previous prime is 1001319989. The next prime is 1001320013. The reversal of 1001320003 is 3000231001.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 1001320003 - 2⁵ = 1001319971 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1001320013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2350 + ... + 44812.

It is an arithmetic number, because the mean of its divisors is an integer number (250346512).

Almost surely, 2^1001320003 is an apocalyptic number.

1001320003 is a deficient number, since it is larger than the sum of its proper divisors (66045).

1001320003 is an equidigital number, since it uses as much as digits as its factorization.

1001320003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66044.

The product of its (nonzero) digits is 18, while the sum is 10.

The square root of 1001320003 is about 31643.6407987450. The cubic root of 1001320003 is about 1000.4398075410.

Adding to 1001320003 its reverse (3000231001), we get a palindrome (4001551004).

The spelling of 1001320003 in words is "one billion, one million, three hundred twenty thousand, three".