217090417 has 2 divisors, whose sum is σ = 217090418. Its totient is φ = 217090416.

The previous prime is 217090403. The next prime is 217090421. The reversal of 217090417 is 714090712.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 153983281 + 63107136 = 12409^2 + 7944^2 .

It is a cyclic number.

It is not a de Polignac number, because 217090417 - 2¹¹ = 217088369 is a prime.

It is not a weakly prime, because it can be changed into another prime (217090217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108545208 + 108545209.

It is an arithmetic number, because the mean of its divisors is an integer number (108545209).

Almost surely, 2^217090417 is an apocalyptic number.

It is an amenable number.

217090417 is a deficient number, since it is larger than the sum of its proper divisors (1).

217090417 is an equidigital number, since it uses as much as digits as its factorization.

217090417 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3528, while the sum is 31.

The square root of 217090417 is about 14733.9884959912. The cubic root of 217090417 is about 601.0079511463.

The spelling of 217090417 in words is "two hundred seventeen million, ninety thousand, four hundred seventeen".