16984909 has 2 divisors, whose sum is σ = 16984910. Its totient is φ = 16984908.

The previous prime is 16984831. The next prime is 16984927. The reversal of 16984909 is 90948961.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15038884 + 1946025 = 3878^2 + 1395^2 .

It is a cyclic number.

It is not a de Polignac number, because 16984909 - 2¹⁵ = 16952141 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16984939) 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, 8492454 + 8492455.

It is an arithmetic number, because the mean of its divisors is an integer number (8492455).

Almost surely, 2^16984909 is an apocalyptic number.

It is an amenable number.

16984909 is a deficient number, since it is larger than the sum of its proper divisors (1).

16984909 is an equidigital number, since it uses as much as digits as its factorization.

16984909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 139968, while the sum is 46.

The square root of 16984909 is about 4121.2751667415. The cubic root of 16984909 is about 257.0520518147.

It can be divided in two parts, 169 and 84909, that added together give a triangular number (85078 = T₄₁₂).

The spelling of 16984909 in words is "sixteen million, nine hundred eighty-four thousand, nine hundred nine".