686806751 has 2 divisors, whose sum is σ = 686806752. Its totient is φ = 686806750.

The previous prime is 686806741. The next prime is 686806789. The reversal of 686806751 is 157608686.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 686806751 - 2¹⁰ = 686805727 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 686806696 and 686806705.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (686806721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343403375 + 343403376.

It is an arithmetic number, because the mean of its divisors is an integer number (343403376).

Almost surely, 2^686806751 is an apocalyptic number.

686806751 is a deficient number, since it is larger than the sum of its proper divisors (1).

686806751 is an equidigital number, since it uses as much as digits as its factorization.

686806751 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 483840, while the sum is 47.

The square root of 686806751 is about 26206.9981302705. The cubic root of 686806751 is about 882.2903282510.

The spelling of 686806751 in words is "six hundred eighty-six million, eight hundred six thousand, seven hundred fifty-one".