685204361 has 2 divisors, whose sum is σ = 685204362. Its totient is φ = 685204360.

The previous prime is 685204291. The next prime is 685204379. The reversal of 685204361 is 163402586.

685204361 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 can be written as a sum of positive squares in only one way, i.e., 617224336 + 67980025 = 24844^2 + 8245^2 .

It is a cyclic number.

It is not a de Polignac number, because 685204361 - 2¹⁴ = 685187977 is a prime.

It is not a weakly prime, because it can be changed into another prime (685204381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 342602180 + 342602181.

It is an arithmetic number, because the mean of its divisors is an integer number (342602181).

Almost surely, 2^685204361 is an apocalyptic number.

It is an amenable number.

685204361 is a deficient number, since it is larger than the sum of its proper divisors (1).

685204361 is an equidigital number, since it uses as much as digits as its factorization.

685204361 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 34560, while the sum is 35.

The square root of 685204361 is about 26176.4084816844. The cubic root of 685204361 is about 881.6036362440.

The spelling of 685204361 in words is "six hundred eighty-five million, two hundred four thousand, three hundred sixty-one".