685983229 has 2 divisors, whose sum is σ = 685983230. Its totient is φ = 685983228.

The previous prime is 685983223. The next prime is 685983241. The reversal of 685983229 is 922389586.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 682411129 + 3572100 = 26123^2 + 1890^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-685983229 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (685983223) 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, 342991614 + 342991615.

It is an arithmetic number, because the mean of its divisors is an integer number (342991615).

Almost surely, 2^685983229 is an apocalyptic number.

It is an amenable number.

685983229 is a deficient number, since it is larger than the sum of its proper divisors (1).

685983229 is an equidigital number, since it uses as much as digits as its factorization.

685983229 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1866240, while the sum is 52.

The square root of 685983229 is about 26191.2815455831. The cubic root of 685983229 is about 881.9375477468.

The spelling of 685983229 in words is "six hundred eighty-five million, nine hundred eighty-three thousand, two hundred twenty-nine".