686645459 has 2 divisors, whose sum is σ = 686645460. Its totient is φ = 686645458.

The previous prime is 686645417. The next prime is 686645489. The reversal of 686645459 is 954546686.

686645459 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 686645459 - 2⁸ = 686645203 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 686645459.

It is not a weakly prime, because it can be changed into another prime (686645489) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343322729 + 343322730.

It is an arithmetic number, because the mean of its divisors is an integer number (343322730).

Almost surely, 2^686645459 is an apocalyptic number.

686645459 is a deficient number, since it is larger than the sum of its proper divisors (1).

686645459 is an equidigital number, since it uses as much as digits as its factorization.

686645459 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6220800, while the sum is 53.

The square root of 686645459 is about 26203.9206799288. The cubic root of 686645459 is about 882.2212561707.

It can be divided in two parts, 6866 and 45459, that added together give a palindrome (52325).

The spelling of 686645459 in words is "six hundred eighty-six million, six hundred forty-five thousand, four hundred fifty-nine".