16854209 has 2 divisors, whose sum is σ = 16854210. Its totient is φ = 16854208.

The previous prime is 16854161. The next prime is 16854221. The reversal of 16854209 is 90245861.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16834609 + 19600 = 4103^2 + 140^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16854209 is a prime.

It is a super-2 number, since 2×16854209² = 568128722031362, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (16854109) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8427104 + 8427105.

It is an arithmetic number, because the mean of its divisors is an integer number (8427105).

Almost surely, 2^16854209 is an apocalyptic number.

It is an amenable number.

16854209 is a deficient number, since it is larger than the sum of its proper divisors (1).

16854209 is an equidigital number, since it uses as much as digits as its factorization.

16854209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17280, while the sum is 35.

The square root of 16854209 is about 4105.3878014141. The cubic root of 16854209 is about 256.3910091254.

The spelling of 16854209 in words is "sixteen million, eight hundred fifty-four thousand, two hundred nine".