225345121 has 2 divisors, whose sum is σ = 225345122. Its totient is φ = 225345120.

The previous prime is 225345101. The next prime is 225345157. The reversal of 225345121 is 121543522.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 219040000 + 6305121 = 14800^2 + 2511^2 .

It is a cyclic number.

It is not a de Polignac number, because 225345121 - 2⁵ = 225345089 is a prime.

It is not a weakly prime, because it can be changed into another prime (225345101) by changing a digit.

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 as a sum of consecutive naturals, namely, 112672560 + 112672561.

It is an arithmetic number, because the mean of its divisors is an integer number (112672561).

Almost surely, 2^225345121 is an apocalyptic number.

It is an amenable number.

225345121 is a deficient number, since it is larger than the sum of its proper divisors (1).

225345121 is an equidigital number, since it uses as much as digits as its factorization.

225345121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2400, while the sum is 25.

The square root of 225345121 is about 15011.4996252873. The cubic root of 225345121 is about 608.5310178242.

Adding to 225345121 its reverse (121543522), we get a palindrome (346888643).

It can be divided in two parts, 2253 and 45121, that added together give a palindrome (47374).

The spelling of 225345121 in words is "two hundred twenty-five million, three hundred forty-five thousand, one hundred twenty-one".