16624217 has 4 divisors (see below), whose sum is σ = 16852020. Its totient is φ = 16396416.

The previous prime is 16624189. The next prime is 16624219. The reversal of 16624217 is 71242661.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 10883401 + 5740816 = 3299^2 + 2396^2 .

It is a cyclic number.

It is not a de Polignac number, because 16624217 - 2⁸ = 16623961 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 16624217.

It is not an unprimeable number, because it can be changed into a prime (16624219) 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, 113792 + ... + 113937.

It is an arithmetic number, because the mean of its divisors is an integer number (4213005).

Almost surely, 2^16624217 is an apocalyptic number.

It is an amenable number.

16624217 is a deficient number, since it is larger than the sum of its proper divisors (227803).

16624217 is an equidigital number, since it uses as much as digits as its factorization.

16624217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 227802.

The product of its digits is 4032, while the sum is 29.

The square root of 16624217 is about 4077.2805888239. The cubic root of 16624217 is about 255.2194292211.

Adding to 16624217 its reverse (71242661), we get a palindrome (87866878).

The spelling of 16624217 in words is "sixteen million, six hundred twenty-four thousand, two hundred seventeen".