217297071 has 24 divisors (see below), whose sum is σ = 319527936. Its totient is φ = 142276560.

The previous prime is 217297061. The next prime is 217297097. The reversal of 217297071 is 170792712.

It is not a de Polignac number, because 217297071 - 2⁵ = 217297039 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (217297001) 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 23 ways as a sum of consecutive naturals, for example, 141916 + ... + 143438.

It is an arithmetic number, because the mean of its divisors is an integer number (13313664).

Almost surely, 2^217297071 is an apocalyptic number.

217297071 is a deficient number, since it is larger than the sum of its proper divisors (102230865).

217297071 is a wasteful number, since it uses less digits than its factorization.

217297071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1803 (or 1800 counting only the distinct ones).

The product of its (nonzero) digits is 12348, while the sum is 36.

The square root of 217297071 is about 14740.9996608100. Note that the first 3 decimals coincide. The cubic root of 217297071 is about 601.1985956862.

The spelling of 217297071 in words is "two hundred seventeen million, two hundred ninety-seven thousand, seventy-one".