2011563 has 6 divisors (see below), whose sum is σ = 2905604. Its totient is φ = 1341036.

The previous prime is 2011561. The next prime is 2011573. The reversal of 2011563 is 3651102.

It is not a de Polignac number, because 2011563 - 2¹ = 2011561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2011561) 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, 111745 + ... + 111762.

2^2011563 is an apocalyptic number.

2011563 is a deficient number, since it is larger than the sum of its proper divisors (894041).

2011563 is a wasteful number, since it uses less digits than its factorization.

2011563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 223513 (or 223510 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 18.

The square root of 2011563 is about 1418.2958083559. The cubic root of 2011563 is about 126.2344463406.

Adding to 2011563 its reverse (3651102), we get a palindrome (5662665).

It can be divided in two parts, 201 and 1563, that added together give a square (1764 = 42²).

The spelling of 2011563 in words is "two million, eleven thousand, five hundred sixty-three".