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213565 = 5112353
BaseRepresentation
bin110100001000111101
3101211221211
4310020331
523313230
64324421
71546432
oct641075
9354854
10213565
11136500
12a3711
1376291
1457b89
154342a
hex3423d

213565 has 12 divisors (see below), whose sum is σ = 282492. Its totient is φ = 154880.

The previous prime is 213557. The next prime is 213589. The reversal of 213565 is 565312.

It is a happy number.

213565 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 81796 + 131769 = 286^2 + 363^2 .

It is not a de Polignac number, because 213565 - 23 = 213557 is a prime.

It is a super-2 number, since 2×2135652 = 91220018450, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 429 + ... + 781.

It is an arithmetic number, because the mean of its divisors is an integer number (23541).

2213565 is an apocalyptic number.

It is an amenable number.

213565 is a deficient number, since it is larger than the sum of its proper divisors (68927).

213565 is a wasteful number, since it uses less digits than its factorization.

213565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 380 (or 369 counting only the distinct ones).

The product of its digits is 900, while the sum is 22.

The square root of 213565 is about 462.1309338272. The cubic root of 213565 is about 59.7736844650.

Adding to 213565 its reverse (565312), we get a palindrome (778877).

The spelling of 213565 in words is "two hundred thirteen thousand, five hundred sixty-five".

Divisors: 1 5 11 55 121 353 605 1765 3883 19415 42713 213565