686000197 has 2 divisors, whose sum is σ = 686000198. Its totient is φ = 686000196.

The previous prime is 686000177. The next prime is 686000221. The reversal of 686000197 is 791000686.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 621455041 + 64545156 = 24929^2 + 8034^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-686000197 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (686000177) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343000098 + 343000099.

It is an arithmetic number, because the mean of its divisors is an integer number (343000099).

Almost surely, 2^686000197 is an apocalyptic number.

It is an amenable number.

686000197 is a deficient number, since it is larger than the sum of its proper divisors (1).

686000197 is an equidigital number, since it uses as much as digits as its factorization.

686000197 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18144, while the sum is 37.

The square root of 686000197 is about 26191.6054681648. The cubic root of 686000197 is about 881.9448193497.

The spelling of 686000197 in words is "six hundred eighty-six million, one hundred ninety-seven", and thus it is an aban number.