225440213 has 8 divisors (see below), whose sum is σ = 240446232. Its totient is φ = 210628096.

The previous prime is 225440209. The next prime is 225440221. The reversal of 225440213 is 312044522.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 92891044 + 132549169 = 9638^2 + 11513^2 .

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

It is not a de Polignac number, because 225440213 - 2² = 225440209 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (225440203) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 46070 + ... + 50727.

It is an arithmetic number, because the mean of its divisors is an integer number (30055779).

Almost surely, 2^225440213 is an apocalyptic number.

It is an amenable number.

225440213 is a deficient number, since it is larger than the sum of its proper divisors (15006019).

225440213 is a wasteful number, since it uses less digits than its factorization.

225440213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96951.

The product of its (nonzero) digits is 1920, while the sum is 23.

The square root of 225440213 is about 15014.6665963650. Note that the first 3 decimals coincide. The cubic root of 225440213 is about 608.6166025392.

Adding to 225440213 its reverse (312044522), we get a palindrome (537484735).

The spelling of 225440213 in words is "two hundred twenty-five million, four hundred forty thousand, two hundred thirteen".