216500317 has 4 divisors (see below), whose sum is σ = 236182176. Its totient is φ = 196818460.

The previous prime is 216500279. The next prime is 216500353. The reversal of 216500317 is 713005612.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-216500317 is a prime.

It is a super-2 number, since 2×216500317² = 93744774522200978, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 216500291 and 216500300.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216500617) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9840913 + ... + 9840934.

It is an arithmetic number, because the mean of its divisors is an integer number (59045544).

Almost surely, 2^216500317 is an apocalyptic number.

It is an amenable number.

216500317 is a deficient number, since it is larger than the sum of its proper divisors (19681859).

216500317 is a wasteful number, since it uses less digits than its factorization.

216500317 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19681858.

The product of its (nonzero) digits is 1260, while the sum is 25.

The square root of 216500317 is about 14713.9497416567. The cubic root of 216500317 is about 600.4628992634.

Adding to 216500317 its reverse (713005612), we get a palindrome (929505929).

The spelling of 216500317 in words is "two hundred sixteen million, five hundred thousand, three hundred seventeen".