686195189 has 4 divisors (see below), whose sum is σ = 690739680. Its totient is φ = 681650700.

The previous prime is 686195171. The next prime is 686195197. The reversal of 686195189 is 981591686.

686195189 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 686195189 - 2²⁸ = 417759733 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 686195189.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (686195119) 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, 2272019 + ... + 2272320.

It is an arithmetic number, because the mean of its divisors is an integer number (172684920).

Almost surely, 2^686195189 is an apocalyptic number.

It is an amenable number.

686195189 is a deficient number, since it is larger than the sum of its proper divisors (4544491).

686195189 is a wasteful number, since it uses less digits than its factorization.

686195189 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4544490.

The product of its digits is 933120, while the sum is 53.

The square root of 686195189 is about 26195.3276177260. The cubic root of 686195189 is about 882.0283741812.

The spelling of 686195189 in words is "six hundred eighty-six million, one hundred ninety-five thousand, one hundred eighty-nine".