16887217 has 2 divisors, whose sum is σ = 16887218. Its totient is φ = 16887216.

The previous prime is 16887209. The next prime is 16887223. The reversal of 16887217 is 71278861.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12117361 + 4769856 = 3481^2 + 2184^2 .

It is a cyclic number.

It is not a de Polignac number, because 16887217 - 2³ = 16887209 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 16887217.

It is not a weakly prime, because it can be changed into another prime (16887287) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8443608 + 8443609.

It is an arithmetic number, because the mean of its divisors is an integer number (8443609).

Almost surely, 2^16887217 is an apocalyptic number.

It is an amenable number.

16887217 is a deficient number, since it is larger than the sum of its proper divisors (1).

16887217 is an equidigital number, since it uses as much as digits as its factorization.

16887217 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 37632, while the sum is 40.

The square root of 16887217 is about 4109.4059181346. The cubic root of 16887217 is about 256.5582756659.

The spelling of 16887217 in words is "sixteen million, eight hundred eighty-seven thousand, two hundred seventeen".