213500565 has 36 divisors (see below), whose sum is σ = 382467852. Its totient is φ = 110171520.

The previous prime is 213500557. The next prime is 213500611. The reversal of 213500565 is 565005312.

213500565 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 84768849 + 128731716 = 9207^2 + 11346^2 .

It is not a de Polignac number, because 213500565 - 2³ = 213500557 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 40777 + ... + 45713.

It is an arithmetic number, because the mean of its divisors is an integer number (10624107).

Almost surely, 2^213500565 is an apocalyptic number.

It is an amenable number.

213500565 is a deficient number, since it is larger than the sum of its proper divisors (168967287).

213500565 is a wasteful number, since it uses less digits than its factorization.

213500565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5010 (or 4976 counting only the distinct ones).

The product of its (nonzero) digits is 4500, while the sum is 27.

The square root of 213500565 is about 14611.6585300916. The cubic root of 213500565 is about 597.6767239250.

Adding to 213500565 its reverse (565005312), we get a palindrome (778505877).

The spelling of 213500565 in words is "two hundred thirteen million, five hundred thousand, five hundred sixty-five".