225685 has 4 divisors (see below), whose sum is σ = 270828. Its totient is φ = 180544.

The previous prime is 225683. The next prime is 225689. The reversal of 225685 is 586522.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 586522 = 2 ⋅293261.

It can be written as a sum of positive squares in 2 ways, for example, as 54289 + 171396 = 233^2 + 414^2 .

It is a cyclic number.

It is not a de Polignac number, because 225685 - 2¹ = 225683 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 12.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (225683) 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, 22564 + ... + 22573.

It is an arithmetic number, because the mean of its divisors is an integer number (67707).

2²²⁵⁶⁸⁵ is an apocalyptic number.

It is an amenable number.

225685 is a deficient number, since it is larger than the sum of its proper divisors (45143).

225685 is an equidigital number, since it uses as much as digits as its factorization.

225685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45142.

The product of its digits is 4800, while the sum is 28.

The square root of 225685 is about 475.0631536964. The cubic root of 225685 is about 60.8836805109.

The spelling of 225685 in words is "two hundred twenty-five thousand, six hundred eighty-five".