2001231003 has 4 divisors (see below), whose sum is σ = 2668308008. Its totient is φ = 1334154000.

The previous prime is 2001230911. The next prime is 2001231049. The reversal of 2001231003 is 3001321002.

It is a happy number.

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

It is not a de Polignac number, because 2001231003 - 2⁸ = 2001230747 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2001231003.

It is not an unprimeable number, because it can be changed into a prime (2001231053) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 333538498 + ... + 333538503.

It is an arithmetic number, because the mean of its divisors is an integer number (667077002).

Almost surely, 2^2001231003 is an apocalyptic number.

2001231003 is a deficient number, since it is larger than the sum of its proper divisors (667077005).

2001231003 is an equidigital number, since it uses as much as digits as its factorization.

2001231003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 667077004.

The product of its (nonzero) digits is 36, while the sum is 12.

The square root of 2001231003 is about 44735.1204647981. The cubic root of 2001231003 is about 1260.1794913105.

Adding to 2001231003 its reverse (3001321002), we get a palindrome (5002552005).

It can be divided in two parts, 20012 and 31003, that added together give a palindrome (51015).

The spelling of 2001231003 in words is "two billion, one million, two hundred thirty-one thousand, three".