685163459 has 2 divisors, whose sum is σ = 685163460. Its totient is φ = 685163458.

The previous prime is 685163449. The next prime is 685163471. The reversal of 685163459 is 954361586.

It is a happy number.

685163459 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-685163459 is a prime.

It is not a weakly prime, because it can be changed into another prime (685163449) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 342581729 + 342581730.

It is an arithmetic number, because the mean of its divisors is an integer number (342581730).

Almost surely, 2^685163459 is an apocalyptic number.

685163459 is a deficient number, since it is larger than the sum of its proper divisors (1).

685163459 is an equidigital number, since it uses as much as digits as its factorization.

685163459 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 777600, while the sum is 47.

The square root of 685163459 is about 26175.6271940139. The cubic root of 685163459 is about 881.5860939985.

The spelling of 685163459 in words is "six hundred eighty-five million, one hundred sixty-three thousand, four hundred fifty-nine".