225504161 has 2 divisors, whose sum is σ = 225504162. Its totient is φ = 225504160.

The previous prime is 225504151. The next prime is 225504187. The reversal of 225504161 is 161405522.

It is an a-pointer prime, because the next prime (225504187) can be obtained adding 225504161 to its sum of digits (26).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 139830625 + 85673536 = 11825^2 + 9256^2 .

It is a cyclic number.

It is not a de Polignac number, because 225504161 - 2¹⁴ = 225487777 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 225504161.

It is not a weakly prime, because it can be changed into another prime (225504131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 112752080 + 112752081.

It is an arithmetic number, because the mean of its divisors is an integer number (112752081).

Almost surely, 2^225504161 is an apocalyptic number.

It is an amenable number.

225504161 is a deficient number, since it is larger than the sum of its proper divisors (1).

225504161 is an equidigital number, since it uses as much as digits as its factorization.

225504161 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2400, while the sum is 26.

The square root of 225504161 is about 15016.7959631874. The cubic root of 225504161 is about 608.6741434937.

Adding to 225504161 its reverse (161405522), we get a palindrome (386909683).

The spelling of 225504161 in words is "two hundred twenty-five million, five hundred four thousand, one hundred sixty-one".