225551 has 4 divisors (see below), whose sum is σ = 226632. Its totient is φ = 224472.

The previous prime is 225529. The next prime is 225569. The reversal of 225551 is 155522.

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, and also an emirpimes, since its reverse is a distinct semiprime: 155522 = 2 ⋅77761.

It is a cyclic number.

It is not a de Polignac number, because 225551 - 2¹⁰ = 224527 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (225581) 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, 116 + ... + 681.

It is an arithmetic number, because the mean of its divisors is an integer number (56658).

2²²⁵⁵⁵¹ is an apocalyptic number.

225551 is a deficient number, since it is larger than the sum of its proper divisors (1081).

225551 is an equidigital number, since it uses as much as digits as its factorization.

225551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1080.

The product of its digits is 500, while the sum is 20.

The square root of 225551 is about 474.9220988752. The cubic root of 225551 is about 60.8716282723.

The spelling of 225551 in words is "two hundred twenty-five thousand, five hundred fifty-one".