686513393 has 2 divisors, whose sum is σ = 686513394. Its totient is φ = 686513392.

The previous prime is 686513381. The next prime is 686513419. The reversal of 686513393 is 393315686.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 556393744 + 130119649 = 23588^2 + 11407^2 .

It is a cyclic number.

It is not a de Polignac number, because 686513393 - 2¹⁰ = 686512369 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (686513353) 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, 343256696 + 343256697.

It is an arithmetic number, because the mean of its divisors is an integer number (343256697).

Almost surely, 2^686513393 is an apocalyptic number.

It is an amenable number.

686513393 is a deficient number, since it is larger than the sum of its proper divisors (1).

686513393 is an equidigital number, since it uses as much as digits as its factorization.

686513393 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 349920, while the sum is 44.

The square root of 686513393 is about 26201.4005923348. The cubic root of 686513393 is about 882.1646918495.

The spelling of 686513393 in words is "six hundred eighty-six million, five hundred thirteen thousand, three hundred ninety-three".