2001223503 has 40 divisors (see below), whose sum is σ = 3101617200. Its totient is φ = 1284377472.

The previous prime is 2001223453. The next prime is 2001223529. The reversal of 2001223503 is 3053221002.

It is not a de Polignac number, because 2001223503 - 2⁶ = 2001223439 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2001223573) 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 39 ways as a sum of consecutive naturals, for example, 959700 + ... + 961782.

It is an arithmetic number, because the mean of its divisors is an integer number (77540430).

Almost surely, 2^2001223503 is an apocalyptic number.

2001223503 is a deficient number, since it is larger than the sum of its proper divisors (1100393697).

2001223503 is a wasteful number, since it uses less digits than its factorization.

2001223503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2533 (or 2524 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 18.

The square root of 2001223503 is about 44735.0366379642. The cubic root of 2001223503 is about 1260.1779170531.

Adding to 2001223503 its reverse (3053221002), we get a palindrome (5054444505).

The spelling of 2001223503 in words is "two billion, one million, two hundred twenty-three thousand, five hundred three".