225340217 has 2 divisors, whose sum is σ = 225340218. Its totient is φ = 225340216.

The previous prime is 225340201. The next prime is 225340243. The reversal of 225340217 is 712043522.

It is an a-pointer prime, because the next prime (225340243) can be obtained adding 225340217 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., 211382521 + 13957696 = 14539^2 + 3736^2 .

It is a cyclic number.

It is not a de Polignac number, because 225340217 - 2⁴ = 225340201 is a prime.

It is equal to p_12400478 and since 225340217 and 12400478 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (225340277) 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, 112670108 + 112670109.

It is an arithmetic number, because the mean of its divisors is an integer number (112670109).

Almost surely, 2^225340217 is an apocalyptic number.

It is an amenable number.

225340217 is a deficient number, since it is larger than the sum of its proper divisors (1).

225340217 is an equidigital number, since it uses as much as digits as its factorization.

225340217 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3360, while the sum is 26.

The square root of 225340217 is about 15011.3362829563. The cubic root of 225340217 is about 608.5266034726.

Adding to 225340217 its reverse (712043522), we get a palindrome (937383739).

The spelling of 225340217 in words is "two hundred twenty-five million, three hundred forty thousand, two hundred seventeen".