684084917 has 2 divisors, whose sum is σ = 684084918. Its totient is φ = 684084916.

The previous prime is 684084901. The next prime is 684084923. The reversal of 684084917 is 719480486.

684084917 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 620707396 + 63377521 = 24914^2 + 7961^2 .

It is a cyclic number.

It is not a de Polignac number, because 684084917 - 2⁴ = 684084901 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (684084617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 342042458 + 342042459.

It is an arithmetic number, because the mean of its divisors is an integer number (342042459).

Almost surely, 2^684084917 is an apocalyptic number.

It is an amenable number.

684084917 is a deficient number, since it is larger than the sum of its proper divisors (1).

684084917 is an equidigital number, since it uses as much as digits as its factorization.

684084917 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 387072, while the sum is 47.

The square root of 684084917 is about 26155.0170521833. The cubic root of 684084917 is about 881.1232716045.

The spelling of 684084917 in words is "six hundred eighty-four million, eighty-four thousand, nine hundred seventeen".