684341017 has 2 divisors, whose sum is σ = 684341018. Its totient is φ = 684341016.

The previous prime is 684340999. The next prime is 684341023. The reversal of 684341017 is 710143486.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 643687641 + 40653376 = 25371^2 + 6376^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-684341017 is a prime.

It is not a weakly prime, because it can be changed into another prime (684341617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 342170508 + 342170509.

It is an arithmetic number, because the mean of its divisors is an integer number (342170509).

Almost surely, 2^684341017 is an apocalyptic number.

It is an amenable number.

684341017 is a deficient number, since it is larger than the sum of its proper divisors (1).

684341017 is an equidigital number, since it uses as much as digits as its factorization.

684341017 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16128, while the sum is 34.

The square root of 684341017 is about 26159.9124042876. The cubic root of 684341017 is about 881.2332128855.

The spelling of 684341017 in words is "six hundred eighty-four million, three hundred forty-one thousand, seventeen".