686054857 has 2 divisors, whose sum is σ = 686054858. Its totient is φ = 686054856.

The previous prime is 686054849. The next prime is 686054899. The reversal of 686054857 is 758450686.

686054857 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 can be written as a sum of positive squares in only one way, i.e., 645363216 + 40691641 = 25404^2 + 6379^2 .

It is a cyclic number.

It is not a de Polignac number, because 686054857 - 2³ = 686054849 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 686054857.

It is not a weakly prime, because it can be changed into another prime (686054807) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343027428 + 343027429.

It is an arithmetic number, because the mean of its divisors is an integer number (343027429).

Almost surely, 2^686054857 is an apocalyptic number.

It is an amenable number.

686054857 is a deficient number, since it is larger than the sum of its proper divisors (1).

686054857 is an equidigital number, since it uses as much as digits as its factorization.

686054857 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1612800, while the sum is 49.

The square root of 686054857 is about 26192.6489114790. The cubic root of 686054857 is about 881.9682429695.

The spelling of 686054857 in words is "six hundred eighty-six million, fifty-four thousand, eight hundred fifty-seven".