685314823 has 2 divisors, whose sum is σ = 685314824. Its totient is φ = 685314822.

The previous prime is 685314821. The next prime is 685314853. The reversal of 685314823 is 328413586.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 685314823 - 2¹ = 685314821 is a prime.

Together with 685314821, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (685314821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 342657411 + 342657412.

It is an arithmetic number, because the mean of its divisors is an integer number (342657412).

Almost surely, 2^685314823 is an apocalyptic number.

685314823 is a deficient number, since it is larger than the sum of its proper divisors (1).

685314823 is an equidigital number, since it uses as much as digits as its factorization.

685314823 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 138240, while the sum is 40.

The square root of 685314823 is about 26178.5183499754. The cubic root of 685314823 is about 881.6510082271.

The spelling of 685314823 in words is "six hundred eighty-five million, three hundred fourteen thousand, eight hundred twenty-three".