225851 has 4 divisors (see below), whose sum is σ = 229104. Its totient is φ = 222600.

The previous prime is 225839. The next prime is 225859. The reversal of 225851 is 158522.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-225851 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 225851.

It is not an unprimeable number, because it can be changed into a prime (225859) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1520 + ... + 1661.

It is an arithmetic number, because the mean of its divisors is an integer number (57276).

2²²⁵⁸⁵¹ is an apocalyptic number.

225851 is a deficient number, since it is larger than the sum of its proper divisors (3253).

225851 is an equidigital number, since it uses as much as digits as its factorization.

225851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3252.

The product of its digits is 800, while the sum is 23.

The square root of 225851 is about 475.2378351941. The cubic root of 225851 is about 60.8986042822.

The spelling of 225851 in words is "two hundred twenty-five thousand, eight hundred fifty-one".