109917809 has 2 divisors, whose sum is σ = 109917810. Its totient is φ = 109917808.

The previous prime is 109917757. The next prime is 109917811. The reversal of 109917809 is 908719901.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 109662784 + 255025 = 10472^2 + 505^2 .

It is a cyclic number.

It is not a de Polignac number, because 109917809 - 2¹⁶ = 109852273 is a prime.

Together with 109917811, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 109917809.

It is not a weakly prime, because it can be changed into another prime (109917839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54958904 + 54958905.

It is an arithmetic number, because the mean of its divisors is an integer number (54958905).

Almost surely, 2^109917809 is an apocalyptic number.

It is an amenable number.

109917809 is a deficient number, since it is larger than the sum of its proper divisors (1).

109917809 is an equidigital number, since it uses as much as digits as its factorization.

109917809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 40824, while the sum is 44.

The square root of 109917809 is about 10484.1694473144. The cubic root of 109917809 is about 479.0226191262.

The spelling of 109917809 in words is "one hundred nine million, nine hundred seventeen thousand, eight hundred nine".