201563 has 4 divisors (see below), whose sum is σ = 202488. Its totient is φ = 200640.

The previous prime is 201557. The next prime is 201577. The reversal of 201563 is 365102.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 201563 - 2⁴ = 201547 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (201163) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 68 + ... + 638.

It is an arithmetic number, because the mean of its divisors is an integer number (50622).

2²⁰¹⁵⁶³ is an apocalyptic number.

201563 is a deficient number, since it is larger than the sum of its proper divisors (925).

201563 is an equidigital number, since it uses as much as digits as its factorization.

201563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 924.

The product of its (nonzero) digits is 180, while the sum is 17.

The square root of 201563 is about 448.9576817474. The cubic root of 201563 is about 58.6323009533.

Adding to 201563 its reverse (365102), we get a palindrome (566665).

The spelling of 201563 in words is "two hundred one thousand, five hundred sixty-three".