225611161 has 4 divisors (see below), whose sum is σ = 225712692. Its totient is φ = 225509632.

The previous prime is 225611159. The next prime is 225611171. The reversal of 225611161 is 161116522.

It is a happy number.

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 128391561 + 97219600 = 11331^2 + 9860^2 .

It is a cyclic number.

It is not a de Polignac number, because 225611161 - 2¹ = 225611159 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (225611171) 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, 47356 + ... + 51901.

It is an arithmetic number, because the mean of its divisors is an integer number (56428173).

Almost surely, 2^225611161 is an apocalyptic number.

It is an amenable number.

225611161 is a deficient number, since it is larger than the sum of its proper divisors (101531).

225611161 is an equidigital number, since it uses as much as digits as its factorization.

225611161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101530.

The product of its digits is 720, while the sum is 25.

The square root of 225611161 is about 15020.3582180985. The cubic root of 225611161 is about 608.7703986801.

Adding to 225611161 its reverse (161116522), we get a palindrome (386727683).

The spelling of 225611161 in words is "two hundred twenty-five million, six hundred eleven thousand, one hundred sixty-one".