686455213 has 2 divisors, whose sum is σ = 686455214. Its totient is φ = 686455212.

The previous prime is 686455141. The next prime is 686455279. The reversal of 686455213 is 312554686.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 490091044 + 196364169 = 22138^2 + 14013^2 .

It is a cyclic number.

It is not a de Polignac number, because 686455213 - 2¹⁷ = 686324141 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (686455613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343227606 + 343227607.

It is an arithmetic number, because the mean of its divisors is an integer number (343227607).

Almost surely, 2^686455213 is an apocalyptic number.

It is an amenable number.

686455213 is a deficient number, since it is larger than the sum of its proper divisors (1).

686455213 is an equidigital number, since it uses as much as digits as its factorization.

686455213 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 172800, while the sum is 40.

The square root of 686455213 is about 26200.2903228189. The cubic root of 686455213 is about 882.1397708539.

The spelling of 686455213 in words is "six hundred eighty-six million, four hundred fifty-five thousand, two hundred thirteen".