2001243 has 4 divisors (see below), whose sum is σ = 2668328. Its totient is φ = 1334160.

The previous prime is 2001229. The next prime is 2001247. The reversal of 2001243 is 3421002.

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

It is not a de Polignac number, because 2001243 - 2⁵ = 2001211 is a prime.

It is a D-number.

It is a Duffinian number.

2001243 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (2001247) 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, 333538 + ... + 333543.

It is an arithmetic number, because the mean of its divisors is an integer number (667082).

2^2001243 is an apocalyptic number.

2001243 is a deficient number, since it is larger than the sum of its proper divisors (667085).

2001243 is an equidigital number, since it uses as much as digits as its factorization.

2001243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 667084.

The product of its (nonzero) digits is 48, while the sum is 12.

The square root of 2001243 is about 1414.6529609766. The cubic root of 2001243 is about 126.0182009484.

Adding to 2001243 its reverse (3421002), we get a palindrome (5422245).

The spelling of 2001243 in words is "two million, one thousand, two hundred forty-three".