225544121 has 6 divisors (see below), whose sum is σ = 247912266. Its totient is φ = 205040000.

The previous prime is 225544091. The next prime is 225544129. The reversal of 225544121 is 121445522.

It can be written as a sum of positive squares in only one way, i.e., 152868496 + 72675625 = 12364^2 + 8525^2 .

It is a de Polignac number, because none of the positive numbers 2^k-225544121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (225544129) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 931880 + ... + 932121.

It is an arithmetic number, because the mean of its divisors is an integer number (41318711).

Almost surely, 2^225544121 is an apocalyptic number.

It is an amenable number.

225544121 is a deficient number, since it is larger than the sum of its proper divisors (22368145).

225544121 is a wasteful number, since it uses less digits than its factorization.

225544121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1864023 (or 1864012 counting only the distinct ones).

The product of its digits is 3200, while the sum is 26.

The square root of 225544121 is about 15018.1264144367. The cubic root of 225544121 is about 608.7100943192.

Adding to 225544121 its reverse (121445522), we get a palindrome (346989643).

The spelling of 225544121 in words is "two hundred twenty-five million, five hundred forty-four thousand, one hundred twenty-one".