686243111 has 4 divisors (see below), whose sum is σ = 716079792. Its totient is φ = 656406432.

The previous prime is 686243053. The next prime is 686243119. The reversal of 686243111 is 111342686.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-686243111 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (686243119) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14918306 + ... + 14918351.

It is an arithmetic number, because the mean of its divisors is an integer number (179019948).

Almost surely, 2^686243111 is an apocalyptic number.

686243111 is a deficient number, since it is larger than the sum of its proper divisors (29836681).

686243111 is a wasteful number, since it uses less digits than its factorization.

686243111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29836680.

The product of its digits is 6912, while the sum is 32.

The square root of 686243111 is about 26196.2423068653. The cubic root of 686243111 is about 882.0489065217.

Adding to 686243111 its reverse (111342686), we get a palindrome (797585797).

The spelling of 686243111 in words is "six hundred eighty-six million, two hundred forty-three thousand, one hundred eleven".