217225147 has 2 divisors, whose sum is σ = 217225148. Its totient is φ = 217225146.

The previous prime is 217225067. The next prime is 217225171. The reversal of 217225147 is 741522712.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 217225147 - 2¹¹ = 217223099 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (217222147) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108612573 + 108612574.

It is an arithmetic number, because the mean of its divisors is an integer number (108612574).

Almost surely, 2^217225147 is an apocalyptic number.

217225147 is a deficient number, since it is larger than the sum of its proper divisors (1).

217225147 is an equidigital number, since it uses as much as digits as its factorization.

217225147 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7840, while the sum is 31.

The square root of 217225147 is about 14738.5598685896. The cubic root of 217225147 is about 601.1322573485.

Adding to 217225147 its reverse (741522712), we get a palindrome (958747859).

The spelling of 217225147 in words is "two hundred seventeen million, two hundred twenty-five thousand, one hundred forty-seven".