686530109 has 4 divisors (see below), whose sum is σ = 687068160. Its totient is φ = 685992060.

The previous prime is 686530099. The next prime is 686530111. The reversal of 686530109 is 901035686.

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 686530109 - 2⁴ = 686530093 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (686530139) 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, 267107 + ... + 269664.

It is an arithmetic number, because the mean of its divisors is an integer number (171767040).

Almost surely, 2^686530109 is an apocalyptic number.

It is an amenable number.

686530109 is a deficient number, since it is larger than the sum of its proper divisors (538051).

686530109 is a wasteful number, since it uses less digits than its factorization.

686530109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 538050.

The product of its (nonzero) digits is 38880, while the sum is 38.

The square root of 686530109 is about 26201.7195809741. The cubic root of 686530109 is about 882.1718517707.

The spelling of 686530109 in words is "six hundred eighty-six million, five hundred thirty thousand, one hundred nine".