16671217 has 4 divisors (see below), whose sum is σ = 16953840. Its totient is φ = 16388596.

The previous prime is 16671209. The next prime is 16671233. The reversal of 16671217 is 71217661.

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 an emirpimes, since its reverse is a distinct semiprime: 71217661 = 59 ⋅1207079.

It is a cyclic number.

It is not a de Polignac number, because 16671217 - 2³ = 16671209 is a prime.

It is a super-2 number, since 2×16671217² = 555858952522178, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16671287) 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, 141223 + ... + 141340.

It is an arithmetic number, because the mean of its divisors is an integer number (4238460).

Almost surely, 2^16671217 is an apocalyptic number.

It is an amenable number.

16671217 is a deficient number, since it is larger than the sum of its proper divisors (282623).

16671217 is an equidigital number, since it uses as much as digits as its factorization.

16671217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 282622.

The product of its digits is 3528, while the sum is 31.

The square root of 16671217 is about 4083.0401663466. The cubic root of 16671217 is about 255.4597217716.

Adding to 16671217 its reverse (71217661), we get a palindrome (87888878).

The spelling of 16671217 in words is "sixteen million, six hundred seventy-one thousand, two hundred seventeen".