684353009 has 2 divisors, whose sum is σ = 684353010. Its totient is φ = 684353008.

The previous prime is 684352997. The next prime is 684353029. The reversal of 684353009 is 900353486.

684353009 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 522351025 + 162001984 = 22855^2 + 12728^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-684353009 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (684353029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 342176504 + 342176505.

It is an arithmetic number, because the mean of its divisors is an integer number (342176505).

Almost surely, 2^684353009 is an apocalyptic number.

It is an amenable number.

684353009 is a deficient number, since it is larger than the sum of its proper divisors (1).

684353009 is an equidigital number, since it uses as much as digits as its factorization.

684353009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 77760, while the sum is 38.

The square root of 684353009 is about 26160.1416089439. The cubic root of 684353009 is about 881.2383602641.

The spelling of 684353009 in words is "six hundred eighty-four million, three hundred fifty-three thousand, nine".