686956189 has 4 divisors (see below), whose sum is σ = 703711260. Its totient is φ = 670201120.

The previous prime is 686956177. The next prime is 686956199. The reversal of 686956189 is 981659686.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 98505625 + 588450564 = 9925^2 + 24258^2 .

It is a cyclic number.

It is not a de Polignac number, because 686956189 - 2¹³ = 686947997 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 (686956129) 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, 8377474 + ... + 8377555.

It is an arithmetic number, because the mean of its divisors is an integer number (175927815).

Almost surely, 2^686956189 is an apocalyptic number.

It is an amenable number.

686956189 is a deficient number, since it is larger than the sum of its proper divisors (16755071).

686956189 is a wasteful number, since it uses less digits than its factorization.

686956189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16755070.

The product of its digits is 5598720, while the sum is 58.

The square root of 686956189 is about 26209.8490838845. The cubic root of 686956189 is about 882.3543142948.

The spelling of 686956189 in words is "six hundred eighty-six million, nine hundred fifty-six thousand, one hundred eighty-nine".