686650843 has 2 divisors, whose sum is σ = 686650844. Its totient is φ = 686650842.

The previous prime is 686650819. The next prime is 686650873. The reversal of 686650843 is 348056686.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 686650843 - 2⁹ = 686650331 is a prime.

It is a super-2 number, since 2×686650843² = 942978760385221298, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 686650793 and 686650802.

It is not a weakly prime, because it can be changed into another prime (686650813) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343325421 + 343325422.

It is an arithmetic number, because the mean of its divisors is an integer number (343325422).

Almost surely, 2^686650843 is an apocalyptic number.

686650843 is a deficient number, since it is larger than the sum of its proper divisors (1).

686650843 is an equidigital number, since it uses as much as digits as its factorization.

686650843 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 829440, while the sum is 46.

The square root of 686650843 is about 26204.0234124457. The cubic root of 686650843 is about 882.2235620026.

The spelling of 686650843 in words is "six hundred eighty-six million, six hundred fifty thousand, eight hundred forty-three".