225642123 has 12 divisors (see below), whose sum is σ = 372488688. Its totient is φ = 128938320.

The previous prime is 225642083. The next prime is 225642133. The reversal of 225642123 is 321246522.

It is a happy number.

225642123 is a `hidden beast` number, since 2 + 2 + 5 + 642 + 12 + 3 = 666.

225642123 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 225642123 - 2¹⁴ = 225625739 is a prime.

It is not an unprimeable number, because it can be changed into a prime (225642133) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1790748 + ... + 1790873.

It is an arithmetic number, because the mean of its divisors is an integer number (31040724).

Almost surely, 2^225642123 is an apocalyptic number.

225642123 is a deficient number, since it is larger than the sum of its proper divisors (146846565).

225642123 is a wasteful number, since it uses less digits than its factorization.

225642123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3581634 (or 3581631 counting only the distinct ones).

The product of its digits is 5760, while the sum is 27.

The square root of 225642123 is about 15021.3888505690. The cubic root of 225642123 is about 608.7982458350.

Adding to 225642123 its reverse (321246522), we get a palindrome (546888645).

The spelling of 225642123 in words is "two hundred twenty-five million, six hundred forty-two thousand, one hundred twenty-three".