201565 has 16 divisors (see below), whose sum is σ = 298368. Its totient is φ = 127296.

The previous prime is 201557. The next prime is 201577. The reversal of 201565 is 565102.

It is a happy number.

It is not a de Polignac number, because 201565 - 2³ = 201557 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 234 + ... + 676.

It is an arithmetic number, because the mean of its divisors is an integer number (18648).

2²⁰¹⁵⁶⁵ is an apocalyptic number.

It is an amenable number.

201565 is a deficient number, since it is larger than the sum of its proper divisors (96803).

201565 is a wasteful number, since it uses less digits than its factorization.

201565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 468.

The product of its (nonzero) digits is 300, while the sum is 19.

The square root of 201565 is about 448.9599091233. The cubic root of 201565 is about 58.6324948782.

Adding to 201565 its reverse (565102), we get a palindrome (766667).

It can be divided in two parts, 2015 and 65, that added together give a triangular number (2080 = T₆₄).

The spelling of 201565 in words is "two hundred one thousand, five hundred sixty-five".