217039317 has 16 divisors (see below), whose sum is σ = 318185472. Its totient is φ = 130500720.

The previous prime is 217039313. The next prime is 217039321. The reversal of 217039317 is 713930712.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (217039313) and next prime (217039321).

It is not a de Polignac number, because 217039317 - 2² = 217039313 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (217039313) 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 in 15 ways as a sum of consecutive naturals, for example, 21703 + ... + 30084.

It is an arithmetic number, because the mean of its divisors is an integer number (19886592).

Almost surely, 2^217039317 is an apocalyptic number.

It is an amenable number.

217039317 is a deficient number, since it is larger than the sum of its proper divisors (101146155).

217039317 is a wasteful number, since it uses less digits than its factorization.

217039317 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51928.

The product of its (nonzero) digits is 7938, while the sum is 33.

The square root of 217039317 is about 14732.2543081499. The cubic root of 217039317 is about 600.9607912014.

The spelling of 217039317 in words is "two hundred seventeen million, thirty-nine thousand, three hundred seventeen".