16687169 has 2 divisors, whose sum is σ = 16687170. Its totient is φ = 16687168.

The previous prime is 16687159. The next prime is 16687171. The reversal of 16687169 is 96178661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14899600 + 1787569 = 3860^2 + 1337^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16687169 is a prime.

It is a super-2 number, since 2×16687169² = 556923218469122, which contains 22 as substring.

Together with 16687171, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (16687129) 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, 8343584 + 8343585.

It is an arithmetic number, because the mean of its divisors is an integer number (8343585).

Almost surely, 2^16687169 is an apocalyptic number.

It is an amenable number.

16687169 is a deficient number, since it is larger than the sum of its proper divisors (1).

16687169 is an equidigital number, since it uses as much as digits as its factorization.

16687169 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 108864, while the sum is 44.

The square root of 16687169 is about 4084.9931456491. The cubic root of 16687169 is about 255.5411754213.

The spelling of 16687169 in words is "sixteen million, six hundred eighty-seven thousand, one hundred sixty-nine".