225631 has 4 divisors (see below), whose sum is σ = 257872. Its totient is φ = 193392.

The previous prime is 225629. The next prime is 225637. The reversal of 225631 is 136522.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 136522 = 2 ⋅68261.

It is a cyclic number.

It is not a de Polignac number, because 225631 - 2¹ = 225629 is a prime.

It is a super-2 number, since 2×225631² = 101818696322, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 11.

It is a junction number, because it is equal to n+sod(n) for n = 225599 and 225608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (225637) 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, 16110 + ... + 16123.

It is an arithmetic number, because the mean of its divisors is an integer number (64468).

2²²⁵⁶³¹ is an apocalyptic number.

225631 is a deficient number, since it is larger than the sum of its proper divisors (32241).

225631 is an equidigital number, since it uses as much as digits as its factorization.

225631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32240.

The product of its digits is 360, while the sum is 19.

The square root of 225631 is about 475.0063157475. The cubic root of 225631 is about 60.8788242126.

The spelling of 225631 in words is "two hundred twenty-five thousand, six hundred thirty-one".