1109689 has 4 divisors (see below), whose sum is σ = 1268224. Its totient is φ = 951156.

The previous prime is 1109663. The next prime is 1109723. The reversal of 1109689 is 9869011.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 9869011 = 401 ⋅24611.

It is a cyclic number.

It is not a de Polignac number, because 1109689 - 2⁷ = 1109561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1109609) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 79257 + ... + 79270.

It is an arithmetic number, because the mean of its divisors is an integer number (317056).

2^1109689 is an apocalyptic number.

It is an amenable number.

1109689 is a deficient number, since it is larger than the sum of its proper divisors (158535).

1109689 is an equidigital number, since it uses as much as digits as its factorization.

1109689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158534.

The product of its (nonzero) digits is 3888, while the sum is 34.

The square root of 1109689 is about 1053.4177708773. The cubic root of 1109689 is about 103.5302097008.

The spelling of 1109689 in words is "one million, one hundred nine thousand, six hundred eighty-nine".