686340871 has 2 divisors, whose sum is σ = 686340872. Its totient is φ = 686340870.

The previous prime is 686340839. The next prime is 686340947. The reversal of 686340871 is 178043686.

686340871 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 686340871 - 2⁵ = 686340839 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (686343871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343170435 + 343170436.

It is an arithmetic number, because the mean of its divisors is an integer number (343170436).

Almost surely, 2^686340871 is an apocalyptic number.

686340871 is a deficient number, since it is larger than the sum of its proper divisors (1).

686340871 is an equidigital number, since it uses as much as digits as its factorization.

686340871 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 193536, while the sum is 43.

The square root of 686340871 is about 26198.1081568880. The cubic root of 686340871 is about 882.0907891556.

The spelling of 686340871 in words is "six hundred eighty-six million, three hundred forty thousand, eight hundred seventy-one".