225423865 has 4 divisors (see below), whose sum is σ = 270508644. Its totient is φ = 180339088.

The previous prime is 225423841. The next prime is 225423871. The reversal of 225423865 is 568324522.

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

It can be written as a sum of positive squares in 2 ways, for example, as 136913401 + 88510464 = 11701^2 + 9408^2 .

It is a cyclic number.

It is not a de Polignac number, because 225423865 - 2⁵ = 225423833 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22542382 + ... + 22542391.

It is an arithmetic number, because the mean of its divisors is an integer number (67627161).

Almost surely, 2^225423865 is an apocalyptic number.

It is an amenable number.

225423865 is a deficient number, since it is larger than the sum of its proper divisors (45084779).

225423865 is an equidigital number, since it uses as much as digits as its factorization.

225423865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45084778.

The product of its digits is 115200, while the sum is 37.

The square root of 225423865 is about 15014.1221854626. The cubic root of 225423865 is about 608.6018907233.

The spelling of 225423865 in words is "two hundred twenty-five million, four hundred twenty-three thousand, eight hundred sixty-five".