225643123 has 2 divisors, whose sum is σ = 225643124. Its totient is φ = 225643122.

The previous prime is 225643097. The next prime is 225643129. The reversal of 225643123 is 321346522.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 225643123 - 2⁹ = 225642611 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 225643091 and 225643100.

It is not a weakly prime, because it can be changed into another prime (225643129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 112821561 + 112821562.

It is an arithmetic number, because the mean of its divisors is an integer number (112821562).

Almost surely, 2^225643123 is an apocalyptic number.

225643123 is a deficient number, since it is larger than the sum of its proper divisors (1).

225643123 is an equidigital number, since it uses as much as digits as its factorization.

225643123 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8640, while the sum is 28.

The square root of 225643123 is about 15021.4221364024. The cubic root of 225643123 is about 608.7991451904.

Adding to 225643123 its reverse (321346522), we get a palindrome (546989645).

The spelling of 225643123 in words is "two hundred twenty-five million, six hundred forty-three thousand, one hundred twenty-three".