217230617 has 2 divisors, whose sum is σ = 217230618. Its totient is φ = 217230616.

The previous prime is 217230613. The next prime is 217230631. The reversal of 217230617 is 716032712.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 123121216 + 94109401 = 11096^2 + 9701^2 .

It is a cyclic number.

It is not a de Polignac number, because 217230617 - 2² = 217230613 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 217230617.

It is not a weakly prime, because it can be changed into another prime (217230613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108615308 + 108615309.

It is an arithmetic number, because the mean of its divisors is an integer number (108615309).

Almost surely, 2^217230617 is an apocalyptic number.

It is an amenable number.

217230617 is a deficient number, since it is larger than the sum of its proper divisors (1).

217230617 is an equidigital number, since it uses as much as digits as its factorization.

217230617 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 29.

The square root of 217230617 is about 14738.7454350769. The cubic root of 217230617 is about 601.1373030594.

The spelling of 217230617 in words is "two hundred seventeen million, two hundred thirty thousand, six hundred seventeen".