685055113 has 2 divisors, whose sum is σ = 685055114. Its totient is φ = 685055112.

The previous prime is 685055099. The next prime is 685055131. The reversal of 685055113 is 311550586.

685055113 = 18507² + 18508².

Together with next prime (685055131) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 342546064 + 342509049 = 18508^2 + 18507^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-685055113 is a prime.

It is not a weakly prime, because it can be changed into another prime (685055153) 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, 342527556 + 342527557.

It is an arithmetic number, because the mean of its divisors is an integer number (342527557).

Almost surely, 2^685055113 is an apocalyptic number.

685055113 is the 18508-th centered square number.

It is an amenable number.

685055113 is a deficient number, since it is larger than the sum of its proper divisors (1).

685055113 is an equidigital number, since it uses as much as digits as its factorization.

685055113 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18000, while the sum is 34.

The square root of 685055113 is about 26173.5575151717. The cubic root of 685055113 is about 881.5396226731.

The spelling of 685055113 in words is "six hundred eighty-five million, fifty-five thousand, one hundred thirteen".