2003563 has 6 divisors (see below), whose sum is σ = 2049356. Its totient is φ = 1958772.

The previous prime is 2003557. The next prime is 2003591. The reversal of 2003563 is 3653002.

It is not a de Polignac number, because 2003563 - 2⁹ = 2003051 is a prime.

It is a Duffinian number.

2003563 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 2003563.

It is not an unprimeable number, because it can be changed into a prime (2003593) 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, 1756 + ... + 2662.

2^2003563 is an apocalyptic number.

2003563 is a deficient number, since it is larger than the sum of its proper divisors (45793).

2003563 is an frugal number, since it uses more digits than its factorization.

2003563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1001 (or 954 counting only the distinct ones).

The product of its (nonzero) digits is 540, while the sum is 19.

The square root of 2003563 is about 1415.4727125593. The cubic root of 2003563 is about 126.0668789155.

Adding to 2003563 its reverse (3653002), we get a palindrome (5656565).

The spelling of 2003563 in words is "two million, three thousand, five hundred sixty-three".