684868897 has 2 divisors, whose sum is σ = 684868898. Its totient is φ = 684868896.

The previous prime is 684868871. The next prime is 684868937. The reversal of 684868897 is 798868486.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 403166241 + 281702656 = 20079^2 + 16784^2 .

It is a cyclic number.

It is not a de Polignac number, because 684868897 - 2¹⁵ = 684836129 is a prime.

It is not a weakly prime, because it can be changed into another prime (684868867) 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, 342434448 + 342434449.

It is an arithmetic number, because the mean of its divisors is an integer number (342434449).

Almost surely, 2^684868897 is an apocalyptic number.

It is an amenable number.

684868897 is a deficient number, since it is larger than the sum of its proper divisors (1).

684868897 is an equidigital number, since it uses as much as digits as its factorization.

684868897 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 37158912, while the sum is 64.

The square root of 684868897 is about 26169.9999426825. Note that the first 4 decimals coincide. The cubic root of 684868897 is about 881.4597402152.

The spelling of 684868897 in words is "six hundred eighty-four million, eight hundred sixty-eight thousand, eight hundred ninety-seven".