16418009 has 2 divisors, whose sum is σ = 16418010. Its totient is φ = 16418008.

The previous prime is 16417997. The next prime is 16418011. The reversal of 16418009 is 90081461.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11256025 + 5161984 = 3355^2 + 2272^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16418009 is a prime.

Together with 16418011, 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 (16418029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8209004 + 8209005.

It is an arithmetic number, because the mean of its divisors is an integer number (8209005).

Almost surely, 2^16418009 is an apocalyptic number.

It is an amenable number.

16418009 is a deficient number, since it is larger than the sum of its proper divisors (1).

16418009 is an equidigital number, since it uses as much as digits as its factorization.

16418009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728, while the sum is 29.

The square root of 16418009 is about 4051.9142389740. The cubic root of 16418009 is about 254.1597822854.

The spelling of 16418009 in words is "sixteen million, four hundred eighteen thousand, nine".