225997217 has 2 divisors, whose sum is σ = 225997218. Its totient is φ = 225997216.

The previous prime is 225997171. The next prime is 225997237. The reversal of 225997217 is 712799522.

225997217 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 225480256 + 516961 = 15016^2 + 719^2 .

It is a cyclic number.

It is not a de Polignac number, because 225997217 - 2¹⁶ = 225931681 is a prime.

It is not a weakly prime, because it can be changed into another prime (225997237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 112998608 + 112998609.

It is an arithmetic number, because the mean of its divisors is an integer number (112998609).

Almost surely, 2^225997217 is an apocalyptic number.

It is an amenable number.

225997217 is a deficient number, since it is larger than the sum of its proper divisors (1).

225997217 is an equidigital number, since it uses as much as digits as its factorization.

225997217 is an evil number, because the sum of its binary digits is even.

The product of its digits is 158760, while the sum is 44.

The square root of 225997217 is about 15033.2038168848. The cubic root of 225997217 is about 609.1174346151.

The spelling of 225997217 in words is "two hundred twenty-five million, nine hundred ninety-seven thousand, two hundred seventeen".