686316073 has 2 divisors, whose sum is σ = 686316074. Its totient is φ = 686316072.

The previous prime is 686316023. The next prime is 686316079. The reversal of 686316073 is 370613686.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 482768784 + 203547289 = 21972^2 + 14267^2 .

It is a cyclic number.

It is not a de Polignac number, because 686316073 - 2¹⁷ = 686185001 is a prime.

It is not a weakly prime, because it can be changed into another prime (686316079) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343158036 + 343158037.

It is an arithmetic number, because the mean of its divisors is an integer number (343158037).

Almost surely, 2^686316073 is an apocalyptic number.

It is an amenable number.

686316073 is a deficient number, since it is larger than the sum of its proper divisors (1).

686316073 is an equidigital number, since it uses as much as digits as its factorization.

686316073 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 40.

The square root of 686316073 is about 26197.6348741637. The cubic root of 686316073 is about 882.0801654981.

The spelling of 686316073 in words is "six hundred eighty-six million, three hundred sixteen thousand, seventy-three".