685105403 has 2 divisors, whose sum is σ = 685105404. Its totient is φ = 685105402.

The previous prime is 685105397. The next prime is 685105409. The reversal of 685105403 is 304501586.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (685105397) and next prime (685105409).

It is a cyclic number.

It is not a de Polignac number, because 685105403 - 2⁴ = 685105387 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 685105403.

It is not a weakly prime, because it can be changed into another prime (685105409) 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, 342552701 + 342552702.

It is an arithmetic number, because the mean of its divisors is an integer number (342552702).

Almost surely, 2^685105403 is an apocalyptic number.

685105403 is a deficient number, since it is larger than the sum of its proper divisors (1).

685105403 is an equidigital number, since it uses as much as digits as its factorization.

685105403 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14400, while the sum is 32.

The square root of 685105403 is about 26174.5181999593. The cubic root of 685105403 is about 881.5611934645.

Adding to 685105403 its reverse (304501586), we get a palindrome (989606989).

The spelling of 685105403 in words is "six hundred eighty-five million, one hundred five thousand, four hundred three".