16605109 has 2 divisors, whose sum is σ = 16605110. Its totient is φ = 16605108.

The previous prime is 16605077. The next prime is 16605143. The reversal of 16605109 is 90150661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14364100 + 2241009 = 3790^2 + 1497^2 .

It is a cyclic number.

It is not a de Polignac number, because 16605109 - 2⁵ = 16605077 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 (16605179) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8302554 + 8302555.

It is an arithmetic number, because the mean of its divisors is an integer number (8302555).

Almost surely, 2^16605109 is an apocalyptic number.

It is an amenable number.

16605109 is a deficient number, since it is larger than the sum of its proper divisors (1).

16605109 is an equidigital number, since it uses as much as digits as its factorization.

16605109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1620, while the sum is 28.

The square root of 16605109 is about 4074.9366866247. The cubic root of 16605109 is about 255.1216080225.

The spelling of 16605109 in words is "sixteen million, six hundred five thousand, one hundred nine".