686910671 has 2 divisors, whose sum is σ = 686910672. Its totient is φ = 686910670.

The previous prime is 686910649. The next prime is 686910673. The reversal of 686910671 is 176019686.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 686910671 - 2⁶ = 686910607 is a prime.

Together with 686910673, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (686910673) 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, 343455335 + 343455336.

It is an arithmetic number, because the mean of its divisors is an integer number (343455336).

Almost surely, 2^686910671 is an apocalyptic number.

686910671 is a deficient number, since it is larger than the sum of its proper divisors (1).

686910671 is an equidigital number, since it uses as much as digits as its factorization.

686910671 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108864, while the sum is 44.

The square root of 686910671 is about 26208.9807318026. The cubic root of 686910671 is about 882.3348254776.

The spelling of 686910671 in words is "six hundred eighty-six million, nine hundred ten thousand, six hundred seventy-one".