225651 has 4 divisors (see below), whose sum is σ = 300872. Its totient is φ = 150432.

The previous prime is 225637. The next prime is 225671. The reversal of 225651 is 156522.

225651 is nontrivially palindromic in base 16.

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

It is not a de Polignac number, because 225651 - 2⁵ = 225619 is a prime.

It is an Ulam number.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 225651.

It is not an unprimeable number, because it can be changed into a prime (225601) 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, 37606 + ... + 37611.

It is an arithmetic number, because the mean of its divisors is an integer number (75218).

2²²⁵⁶⁵¹ is an apocalyptic number.

225651 is a deficient number, since it is larger than the sum of its proper divisors (75221).

225651 is an equidigital number, since it uses as much as digits as its factorization.

225651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75220.

The product of its digits is 600, while the sum is 21.

The square root of 225651 is about 475.0273676326. The cubic root of 225651 is about 60.8806229320.

The spelling of 225651 in words is "two hundred twenty-five thousand, six hundred fifty-one".