225861 has 8 divisors (see below), whose sum is σ = 305280. Its totient is φ = 148512.

The previous prime is 225859. The next prime is 225871. The reversal of 225861 is 168522.

225861 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 225861 - 2¹ = 225859 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 (225821) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 240 + ... + 713.

It is an arithmetic number, because the mean of its divisors is an integer number (38160).

2²²⁵⁸⁶¹ is an apocalyptic number.

It is an amenable number.

225861 is a deficient number, since it is larger than the sum of its proper divisors (79419).

225861 is an equidigital number, since it uses as much as digits as its factorization.

225861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1035.

The product of its digits is 960, while the sum is 24.

The square root of 225861 is about 475.2483561255. The cubic root of 225861 is about 60.8995030711.

The spelling of 225861 in words is "two hundred twenty-five thousand, eight hundred sixty-one".