685103 has 2 divisors, whose sum is σ = 685104. Its totient is φ = 685102.

The previous prime is 685099. The next prime is 685109. The reversal of 685103 is 301586.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 685103 - 2² = 685099 is a prime.

It is a super-2 number, since 2×685103² = 938732241218, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (685109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 342551 + 342552.

It is an arithmetic number, because the mean of its divisors is an integer number (342552).

2⁶⁸⁵¹⁰³ is an apocalyptic number.

685103 is a deficient number, since it is larger than the sum of its proper divisors (1).

685103 is an equidigital number, since it uses as much as digits as its factorization.

685103 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 685103 is about 827.7094900990. The cubic root of 685103 is about 88.1560162774.

Adding to 685103 its reverse (301586), we get a palindrome (986689).

The spelling of 685103 in words is "six hundred eighty-five thousand, one hundred three".