685548593 has 2 divisors, whose sum is σ = 685548594. Its totient is φ = 685548592.

The previous prime is 685548583. The next prime is 685548629. The reversal of 685548593 is 395845586.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 415833664 + 269714929 = 20392^2 + 16423^2 .

It is a cyclic number.

It is not a de Polignac number, because 685548593 - 2⁶ = 685548529 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (685548503) 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, 342774296 + 342774297.

It is an arithmetic number, because the mean of its divisors is an integer number (342774297).

Almost surely, 2^685548593 is an apocalyptic number.

It is an amenable number.

685548593 is a deficient number, since it is larger than the sum of its proper divisors (1).

685548593 is an equidigital number, since it uses as much as digits as its factorization.

685548593 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5184000, while the sum is 53.

The square root of 685548593 is about 26182.9828896556. The cubic root of 685548593 is about 881.7512444586.

The spelling of 685548593 in words is "six hundred eighty-five million, five hundred forty-eight thousand, five hundred ninety-three".