2001303 has 6 divisors (see below), whose sum is σ = 2890784. Its totient is φ = 1334196.

The previous prime is 2001281. The next prime is 2001313. The reversal of 2001303 is 3031002.

It is a happy number.

It is not a de Polignac number, because 2001303 - 2¹⁶ = 1935767 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9), and also a Moran number because the ratio is a prime number: 222367 = 2001303 / (2 + 0 + 0 + 1 + 3 + 0 + 3).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2001313) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 111175 + ... + 111192.

2^2001303 is an apocalyptic number.

2001303 is a deficient number, since it is larger than the sum of its proper divisors (889481).

2001303 is a wasteful number, since it uses less digits than its factorization.

2001303 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222373 (or 222370 counting only the distinct ones).

The product of its (nonzero) digits is 18, while the sum is 9.

The square root of 2001303 is about 1414.6741674322. The cubic root of 2001303 is about 126.0194603351.

Adding to 2001303 its reverse (3031002), we get a palindrome (5032305).

It can be divided in two parts, 2001 and 303, that added together give a square (2304 = 48²).

The spelling of 2001303 in words is "two million, one thousand, three hundred three".