685503449 has 2 divisors, whose sum is σ = 685503450. Its totient is φ = 685503448.

The previous prime is 685503433. The next prime is 685503487. The reversal of 685503449 is 944305586.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 374616025 + 310887424 = 19355^2 + 17632^2 .

It is a cyclic number.

It is not a de Polignac number, because 685503449 - 2⁴ = 685503433 is a prime.

It is not a weakly prime, because it can be changed into another prime (685503499) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 342751724 + 342751725.

It is an arithmetic number, because the mean of its divisors is an integer number (342751725).

Almost surely, 2^685503449 is an apocalyptic number.

It is an amenable number.

685503449 is a deficient number, since it is larger than the sum of its proper divisors (1).

685503449 is an equidigital number, since it uses as much as digits as its factorization.

685503449 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 518400, while the sum is 44.

The square root of 685503449 is about 26182.1207888131. The cubic root of 685503449 is about 881.7318893259.

The spelling of 685503449 in words is "six hundred eighty-five million, five hundred three thousand, four hundred forty-nine".