225642523 has 4 divisors (see below), whose sum is σ = 226412928. Its totient is φ = 224872120.

The previous prime is 225642517. The next prime is 225642541. The reversal of 225642523 is 325246522.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-225642523 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (225642623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 384763 + ... + 385348.

It is an arithmetic number, because the mean of its divisors is an integer number (56603232).

Almost surely, 2^225642523 is an apocalyptic number.

225642523 is a deficient number, since it is larger than the sum of its proper divisors (770405).

225642523 is an equidigital number, since it uses as much as digits as its factorization.

225642523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 770404.

The product of its digits is 28800, while the sum is 31.

The square root of 225642523 is about 15021.4021649112. The cubic root of 225642523 is about 608.7986055775.

The spelling of 225642523 in words is "two hundred twenty-five million, six hundred forty-two thousand, five hundred twenty-three".