1109609 has 2 divisors, whose sum is σ = 1109610. Its totient is φ = 1109608.

The previous prime is 1109579. The next prime is 1109611. The reversal of 1109609 is 9069011.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 994009 + 115600 = 997^2 + 340^2 .

It is a cyclic number.

It is not a de Polignac number, because 1109609 - 2¹² = 1105513 is a prime.

Together with 1109611, 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 (1109629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 554804 + 554805.

It is an arithmetic number, because the mean of its divisors is an integer number (554805).

2^1109609 is an apocalyptic number.

It is an amenable number.

1109609 is a deficient number, since it is larger than the sum of its proper divisors (1).

1109609 is an equidigital number, since it uses as much as digits as its factorization.

1109609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 486, while the sum is 26.

The square root of 1109609 is about 1053.3797985532. The cubic root of 1109609 is about 103.5277217317.

The spelling of 1109609 in words is "one million, one hundred nine thousand, six hundred nine".