16705217 has 4 divisors (see below), whose sum is σ = 16714176. Its totient is φ = 16696260.

The previous prime is 16705193. The next prime is 16705219. The reversal of 16705217 is 71250761.

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, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 71250761 = 1453 ⋅49037.

It is a cyclic number.

It is not a de Polignac number, because 16705217 - 2¹⁶ = 16639681 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 16705217.

It is not an unprimeable number, because it can be changed into a prime (16705219) 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, 509 + ... + 5802.

It is an arithmetic number, because the mean of its divisors is an integer number (4178544).

Almost surely, 2^16705217 is an apocalyptic number.

It is an amenable number.

16705217 is a deficient number, since it is larger than the sum of its proper divisors (8959).

16705217 is an equidigital number, since it uses as much as digits as its factorization.

16705217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8958.

The product of its (nonzero) digits is 2940, while the sum is 29.

The square root of 16705217 is about 4087.2016099038. The cubic root of 16705217 is about 255.6332690418.

Adding to 16705217 its reverse (71250761), we get a palindrome (87955978).

The spelling of 16705217 in words is "sixteen million, seven hundred five thousand, two hundred seventeen".