1109909 has 2 divisors, whose sum is σ = 1109910. Its totient is φ = 1109908.

The previous prime is 1109903. The next prime is 1109921. The reversal of 1109909 is 9099011.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 624100 + 485809 = 790^2 + 697^2 .

It is a cyclic number.

It is not a de Polignac number, because 1109909 - 2⁸ = 1109653 is a prime.

It is equal to p₈₆₄₄₇ and since 1109909 and 86447 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1109903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 554954 + 554955.

It is an arithmetic number, because the mean of its divisors is an integer number (554955).

2^1109909 is an apocalyptic number.

It is an amenable number.

1109909 is a deficient number, since it is larger than the sum of its proper divisors (1).

1109909 is an equidigital number, since it uses as much as digits as its factorization.

1109909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 729, while the sum is 29.

The square root of 1109909 is about 1053.5221877113. The cubic root of 1109909 is about 103.5370509993.

The spelling of 1109909 in words is "one million, one hundred nine thousand, nine hundred nine".