686467213 has 2 divisors, whose sum is σ = 686467214. Its totient is φ = 686467212.

The previous prime is 686467181. The next prime is 686467241. The reversal of 686467213 is 312764686.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 414448164 + 272019049 = 20358^2 + 16493^2 .

It is a cyclic number.

It is not a de Polignac number, because 686467213 - 2⁵ = 686467181 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 686467213.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (686467013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343233606 + 343233607.

It is an arithmetic number, because the mean of its divisors is an integer number (343233607).

Almost surely, 2^686467213 is an apocalyptic number.

It is an amenable number.

686467213 is a deficient number, since it is larger than the sum of its proper divisors (1).

686467213 is an equidigital number, since it uses as much as digits as its factorization.

686467213 is an evil number, because the sum of its binary digits is even.

The product of its digits is 290304, while the sum is 43.

The square root of 686467213 is about 26200.5193269141. The cubic root of 686467213 is about 882.1449110852.

The spelling of 686467213 in words is "six hundred eighty-six million, four hundred sixty-seven thousand, two hundred thirteen".