686004217 has 2 divisors, whose sum is σ = 686004218. Its totient is φ = 686004216.

The previous prime is 686004199. The next prime is 686004227. The reversal of 686004217 is 712400686.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 632069881 + 53934336 = 25141^2 + 7344^2 .

It is a cyclic number.

It is not a de Polignac number, because 686004217 - 2¹¹ = 686002169 is a prime.

It is equal to p_35565154 and since 686004217 and 35565154 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (686004227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343002108 + 343002109.

It is an arithmetic number, because the mean of its divisors is an integer number (343002109).

Almost surely, 2^686004217 is an apocalyptic number.

It is an amenable number.

686004217 is a deficient number, since it is larger than the sum of its proper divisors (1).

686004217 is an equidigital number, since it uses as much as digits as its factorization.

686004217 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16128, while the sum is 34.

The square root of 686004217 is about 26191.6822101980. The cubic root of 686004217 is about 881.9465420952.

The spelling of 686004217 in words is "six hundred eighty-six million, four thousand, two hundred seventeen".