225817 has 4 divisors (see below), whose sum is σ = 226996. Its totient is φ = 224640.

The previous prime is 225809. The next prime is 225821. The reversal of 225817 is 718522.

225817 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 can be written as a sum of positive squares in 2 ways, for example, as 80656 + 145161 = 284^2 + 381^2 .

It is a cyclic number.

It is not a de Polignac number, because 225817 - 2³ = 225809 is a prime.

It is a Duffinian number.

225817 is a lucky number.

It is a nialpdrome in base 12.

It is a junction number, because it is equal to n+sod(n) for n = 225791 and 225800.

It is not an unprimeable number, because it can be changed into a prime (225217) 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, 228 + ... + 709.

It is an arithmetic number, because the mean of its divisors is an integer number (56749).

2²²⁵⁸¹⁷ is an apocalyptic number.

It is an amenable number.

225817 is a deficient number, since it is larger than the sum of its proper divisors (1179).

225817 is an equidigital number, since it uses as much as digits as its factorization.

225817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1178.

The product of its digits is 1120, while the sum is 25.

The square root of 225817 is about 475.2020622851. The cubic root of 225817 is about 60.8955482018.

The spelling of 225817 in words is "two hundred twenty-five thousand, eight hundred seventeen".