225731 has 4 divisors (see below), whose sum is σ = 246264. Its totient is φ = 205200.

The previous prime is 225721. The next prime is 225733. The reversal of 225731 is 137522.

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

It is a cyclic number.

It is not a de Polignac number, because 225731 - 2¹⁴ = 209347 is a prime.

It is a super-2 number, since 2×225731² = 101908968722, which contains 22 as substring.

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 225731.

It is not an unprimeable number, because it can be changed into a prime (225733) 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, 10250 + ... + 10271.

It is an arithmetic number, because the mean of its divisors is an integer number (61566).

2²²⁵⁷³¹ is an apocalyptic number.

225731 is a deficient number, since it is larger than the sum of its proper divisors (20533).

225731 is a wasteful number, since it uses less digits than its factorization.

225731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20532.

The product of its digits is 420, while the sum is 20.

The square root of 225731 is about 475.1115658453. Note that the first 3 decimals coincide. The cubic root of 225731 is about 60.8878167466.

Subtracting from 225731 its reverse (137522), we obtain a square (88209 = 297²).

The spelling of 225731 in words is "two hundred twenty-five thousand, seven hundred thirty-one".