685956043 has 2 divisors, whose sum is σ = 685956044. Its totient is φ = 685956042.

The previous prime is 685955999. The next prime is 685956049. The reversal of 685956043 is 340659586.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-685956043 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 685955984 and 685956002.

It is not a weakly prime, because it can be changed into another prime (685956049) 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, 342978021 + 342978022.

It is an arithmetic number, because the mean of its divisors is an integer number (342978022).

Almost surely, 2^685956043 is an apocalyptic number.

685956043 is a deficient number, since it is larger than the sum of its proper divisors (1).

685956043 is an equidigital number, since it uses as much as digits as its factorization.

685956043 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 777600, while the sum is 46.

The square root of 685956043 is about 26190.7625509453. The cubic root of 685956043 is about 881.9258969902.

The spelling of 685956043 in words is "six hundred eighty-five million, nine hundred fifty-six thousand, forty-three".