2001003443 has 4 divisors (see below), whose sum is σ = 2001093288. Its totient is φ = 2000913600.

The previous prime is 2001003439. The next prime is 2001003493. The reversal of 2001003443 is 3443001002.

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 2001003443 - 2² = 2001003439 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2001003413) 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, 16280 + ... + 65322.

It is an arithmetic number, because the mean of its divisors is an integer number (500273322).

Almost surely, 2^2001003443 is an apocalyptic number.

2001003443 is a deficient number, since it is larger than the sum of its proper divisors (89845).

2001003443 is an equidigital number, since it uses as much as digits as its factorization.

2001003443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89844.

The product of its (nonzero) digits is 288, while the sum is 17.

The square root of 2001003443 is about 44732.5769769639. The cubic root of 2001003443 is about 1260.1317244918.

Adding to 2001003443 its reverse (3443001002), we get a palindrome (5444004445).

The spelling of 2001003443 in words is "two billion, one million, three thousand, four hundred forty-three".