684410641 has 2 divisors, whose sum is σ = 684410642. Its totient is φ = 684410640.

The previous prime is 684410611. The next prime is 684410693. The reversal of 684410641 is 146014486.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 454585041 + 229825600 = 21321^2 + 15160^2 .

It is a cyclic number.

It is not a de Polignac number, because 684410641 - 2¹⁷ = 684279569 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 684410597 and 684410606.

It is not a weakly prime, because it can be changed into another prime (684410611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 342205320 + 342205321.

It is an arithmetic number, because the mean of its divisors is an integer number (342205321).

Almost surely, 2^684410641 is an apocalyptic number.

It is an amenable number.

684410641 is a deficient number, since it is larger than the sum of its proper divisors (1).

684410641 is an equidigital number, since it uses as much as digits as its factorization.

684410641 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18432, while the sum is 34.

The square root of 684410641 is about 26161.2431088433. The cubic root of 684410641 is about 881.2630970607.

The spelling of 684410641 in words is "six hundred eighty-four million, four hundred ten thousand, six hundred forty-one".