109965209 has 2 divisors, whose sum is σ = 109965210. Its totient is φ = 109965208.

The previous prime is 109965173. The next prime is 109965227. The reversal of 109965209 is 902569901.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 98942809 + 11022400 = 9947^2 + 3320^2 .

It is a cyclic number.

It is not a de Polignac number, because 109965209 - 2²⁴ = 93187993 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (109965269) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54982604 + 54982605.

It is an arithmetic number, because the mean of its divisors is an integer number (54982605).

Almost surely, 2^109965209 is an apocalyptic number.

It is an amenable number.

109965209 is a deficient number, since it is larger than the sum of its proper divisors (1).

109965209 is an equidigital number, since it uses as much as digits as its factorization.

109965209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 43740, while the sum is 41.

The square root of 109965209 is about 10486.4297546877. The cubic root of 109965209 is about 479.0914657469.

The spelling of 109965209 in words is "one hundred nine million, nine hundred sixty-five thousand, two hundred nine".