225213845 has 8 divisors (see below), whose sum is σ = 270530520. Its totient is φ = 179988480.

The previous prime is 225213809. The next prime is 225213851. The reversal of 225213845 is 548312522.

It can be written as a sum of positive squares in 4 ways, for example, as 26770276 + 198443569 = 5174^2 + 14087^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-225213845 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17276 + ... + 27365.

It is an arithmetic number, because the mean of its divisors is an integer number (33816315).

Almost surely, 2^225213845 is an apocalyptic number.

It is an amenable number.

225213845 is a deficient number, since it is larger than the sum of its proper divisors (45316675).

225213845 is a wasteful number, since it uses less digits than its factorization.

225213845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45655.

The product of its digits is 19200, while the sum is 32.

The square root of 225213845 is about 15007.1264737790. The cubic root of 225213845 is about 608.4128272089.

The spelling of 225213845 in words is "two hundred twenty-five million, two hundred thirteen thousand, eight hundred forty-five".