686563109 has 4 divisors (see below), whose sum is σ = 686615616. Its totient is φ = 686510604.

The previous prime is 686563103. The next prime is 686563121. The reversal of 686563109 is 901365686.

686563109 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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 686563109 - 2⁴ = 686563093 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 686563109.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (686563103) 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, 10682 + ... + 38564.

It is an arithmetic number, because the mean of its divisors is an integer number (171653904).

Almost surely, 2^686563109 is an apocalyptic number.

It is an amenable number.

686563109 is a deficient number, since it is larger than the sum of its proper divisors (52507).

686563109 is a wasteful number, since it uses less digits than its factorization.

686563109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52506.

The product of its (nonzero) digits is 233280, while the sum is 44.

The square root of 686563109 is about 26202.3493030682. The cubic root of 686563109 is about 882.1859862343.

The spelling of 686563109 in words is "six hundred eighty-six million, five hundred sixty-three thousand, one hundred nine".