2001503 has 6 divisors (see below), whose sum is σ = 2328336. Its totient is φ = 1715532.

The previous prime is 2001487. The next prime is 2001509. The reversal of 2001503 is 3051002.

It is not a de Polignac number, because 2001503 - 2⁴ = 2001487 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2001509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 20375 + ... + 20472.

It is an arithmetic number, because the mean of its divisors is an integer number (388056).

2^2001503 is an apocalyptic number.

2001503 is a deficient number, since it is larger than the sum of its proper divisors (326833).

2001503 is an equidigital number, since it uses as much as digits as its factorization.

2001503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40861 (or 40854 counting only the distinct ones).

The product of its (nonzero) digits is 30, while the sum is 11.

The square root of 2001503 is about 1414.7448533216. The cubic root of 2001503 is about 126.0236581091.

Adding to 2001503 its reverse (3051002), we get a palindrome (5052505).

The spelling of 2001503 in words is "two million, one thousand, five hundred three".