212231565 has 48 divisors (see below), whose sum is σ = 452769408. Its totient is φ = 89555328.

The previous prime is 212231561. The next prime is 212231597. The reversal of 212231565 is 565132212.

It is a happy number.

212231565 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 212231565 - 2² = 212231561 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212231561) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 21819 + ... + 30008.

It is an arithmetic number, because the mean of its divisors is an integer number (9432696).

Almost surely, 2^212231565 is an apocalyptic number.

It is an amenable number.

212231565 is an abundant number, since it is smaller than the sum of its proper divisors (240537843).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

212231565 is a wasteful number, since it uses less digits than its factorization.

212231565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51858 (or 51855 counting only the distinct ones).

The product of its digits is 3600, while the sum is 27.

The square root of 212231565 is about 14568.1695830327. The cubic root of 212231565 is about 596.4902174098.

Adding to 212231565 its reverse (565132212), we get a palindrome (777363777).

The spelling of 212231565 in words is "two hundred twelve million, two hundred thirty-one thousand, five hundred sixty-five".