225216605 has 4 divisors (see below), whose sum is σ = 270259932. Its totient is φ = 180173280.

The previous prime is 225216601. The next prime is 225216613. The reversal of 225216605 is 506612522.

225216605 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 66406201 + 158810404 = 8149^2 + 12602^2 .

It is not a de Polignac number, because 225216605 - 2² = 225216601 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (225216601) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22521656 + ... + 22521665.

It is an arithmetic number, because the mean of its divisors is an integer number (67564983).

Almost surely, 2^225216605 is an apocalyptic number.

It is an amenable number.

225216605 is a deficient number, since it is larger than the sum of its proper divisors (45043327).

225216605 is an equidigital number, since it uses as much as digits as its factorization.

225216605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45043326.

The product of its (nonzero) digits is 7200, while the sum is 29.

The square root of 225216605 is about 15007.2184298090. The cubic root of 225216605 is about 608.4153125691.

The spelling of 225216605 in words is "two hundred twenty-five million, two hundred sixteen thousand, six hundred five".