689109 has 4 divisors (see below), whose sum is σ = 918816. Its totient is φ = 459404.

The previous prime is 689107. The next prime is 689113. The reversal of 689109 is 901986.

It is a happy number.

689109 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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.

It is a cyclic number.

It is not a de Polignac number, because 689109 - 2¹ = 689107 is a prime.

It is a D-number.

It is a Curzon number.

It is a zygodrome in base 4.

It is a self number, because there is not a number n which added to its sum of digits gives 689109.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (689107) 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, 114849 + ... + 114854.

It is an arithmetic number, because the mean of its divisors is an integer number (229704).

2⁶⁸⁹¹⁰⁹ is an apocalyptic number.

It is an amenable number.

689109 is a deficient number, since it is larger than the sum of its proper divisors (229707).

689109 is a wasteful number, since it uses less digits than its factorization.

689109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 229706.

The product of its (nonzero) digits is 3888, while the sum is 33.

The square root of 689109 is about 830.1258940667. The cubic root of 689109 is about 88.3275072302.

The spelling of 689109 in words is "six hundred eighty-nine thousand, one hundred nine".