686536859 has 2 divisors, whose sum is σ = 686536860. Its totient is φ = 686536858.

The previous prime is 686536853. The next prime is 686536871. The reversal of 686536859 is 958635686.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-686536859 is a prime.

It is a super-3 number, since 3×686536859³ (a number of 27 digits) contains 333 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (686536853) 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 as a sum of consecutive naturals, namely, 343268429 + 343268430.

It is an arithmetic number, because the mean of its divisors is an integer number (343268430).

Almost surely, 2^686536859 is an apocalyptic number.

686536859 is a deficient number, since it is larger than the sum of its proper divisors (1).

686536859 is an equidigital number, since it uses as much as digits as its factorization.

686536859 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9331200, while the sum is 56.

The square root of 686536859 is about 26201.8483889973. The cubic root of 686536859 is about 882.1747429478.

The spelling of 686536859 in words is "six hundred eighty-six million, five hundred thirty-six thousand, eight hundred fifty-nine".