685338473 has 2 divisors, whose sum is σ = 685338474. Its totient is φ = 685338472.

The previous prime is 685338461. The next prime is 685338503. The reversal of 685338473 is 374833586.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 587189824 + 98148649 = 24232^2 + 9907^2 .

It is a cyclic number.

It is not a de Polignac number, because 685338473 - 2¹⁰ = 685337449 is a prime.

It is not a weakly prime, because it can be changed into another prime (685338403) 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, 342669236 + 342669237.

It is an arithmetic number, because the mean of its divisors is an integer number (342669237).

Almost surely, 2^685338473 is an apocalyptic number.

It is an amenable number.

685338473 is a deficient number, since it is larger than the sum of its proper divisors (1).

685338473 is an equidigital number, since it uses as much as digits as its factorization.

685338473 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1451520, while the sum is 47.

The square root of 685338473 is about 26178.9700523149. The cubic root of 685338473 is about 881.6611499439.

The spelling of 685338473 in words is "six hundred eighty-five million, three hundred thirty-eight thousand, four hundred seventy-three".