225881 has 4 divisors (see below), whose sum is σ = 233700. Its totient is φ = 218064.

The previous prime is 225871. The next prime is 225889. The reversal of 225881 is 188522.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 188522 = 2 ⋅94261.

It can be written as a sum of positive squares in 2 ways, for example, as 126025 + 99856 = 355^2 + 316^2 .

It is a cyclic number.

It is not a de Polignac number, because 225881 - 2¹⁴ = 209497 is a prime.

It is a super-2 number, since 2×225881² = 102044452322, which contains 22 as substring.

It is a Duffinian number.

It is a nialpdrome in base 12.

It is a self number, because there is not a number n which added to its sum of digits gives 225881.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 225881.

It is not an unprimeable number, because it can be changed into a prime (225889) 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, 3866 + ... + 3923.

It is an arithmetic number, because the mean of its divisors is an integer number (58425).

2²²⁵⁸⁸¹ is an apocalyptic number.

It is an amenable number.

225881 is a deficient number, since it is larger than the sum of its proper divisors (7819).

225881 is an equidigital number, since it uses as much as digits as its factorization.

225881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7818.

The product of its digits is 1280, while the sum is 26.

The square root of 225881 is about 475.2693972896. The cubic root of 225881 is about 60.9013005691.

The spelling of 225881 in words is "two hundred twenty-five thousand, eight hundred eighty-one".