685390579 has 2 divisors, whose sum is σ = 685390580. Its totient is φ = 685390578.

The previous prime is 685390567. The next prime is 685390597. The reversal of 685390579 is 975093586.

Together with next prime (685390597) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 685390579 - 2⁷ = 685390451 is a prime.

It is not a weakly prime, because it can be changed into another prime (685390529) 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, 342695289 + 342695290.

It is an arithmetic number, because the mean of its divisors is an integer number (342695290).

Almost surely, 2^685390579 is an apocalyptic number.

685390579 is a deficient number, since it is larger than the sum of its proper divisors (1).

685390579 is an equidigital number, since it uses as much as digits as its factorization.

685390579 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2041200, while the sum is 52.

The square root of 685390579 is about 26179.9652215201. The cubic root of 685390579 is about 881.6834934882.

The spelling of 685390579 in words is "six hundred eighty-five million, three hundred ninety thousand, five hundred seventy-nine".