1109789 has 2 divisors, whose sum is σ = 1109790. Its totient is φ = 1109788.

The previous prime is 1109783. The next prime is 1109791. The reversal of 1109789 is 9879011.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1085764 + 24025 = 1042^2 + 155^2 .

It is a cyclic number.

It is not a de Polignac number, because 1109789 - 2⁸ = 1109533 is a prime.

Together with 1109791, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1109783) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 554894 + 554895.

It is an arithmetic number, because the mean of its divisors is an integer number (554895).

2^1109789 is an apocalyptic number.

It is an amenable number.

1109789 is a deficient number, since it is larger than the sum of its proper divisors (1).

1109789 is an equidigital number, since it uses as much as digits as its factorization.

1109789 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4536, while the sum is 35.

The square root of 1109789 is about 1053.4652343575. The cubic root of 1109789 is about 103.5333194940.

The spelling of 1109789 in words is "one million, one hundred nine thousand, seven hundred eighty-nine".