684585193 has 2 divisors, whose sum is σ = 684585194. Its totient is φ = 684585192.

The previous prime is 684585173. The next prime is 684585199. The reversal of 684585193 is 391585486.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 579461184 + 105124009 = 24072^2 + 10253^2 .

It is a cyclic number.

It is not a de Polignac number, because 684585193 - 2¹³ = 684577001 is a prime.

It is not a weakly prime, because it can be changed into another prime (684585199) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 342292596 + 342292597.

It is an arithmetic number, because the mean of its divisors is an integer number (342292597).

Almost surely, 2^684585193 is an apocalyptic number.

It is an amenable number.

684585193 is a deficient number, since it is larger than the sum of its proper divisors (1).

684585193 is an equidigital number, since it uses as much as digits as its factorization.

684585193 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1036800, while the sum is 49.

The square root of 684585193 is about 26164.5789761655. The cubic root of 684585193 is about 881.3380097673.

The spelling of 684585193 in words is "six hundred eighty-four million, five hundred eighty-five thousand, one hundred ninety-three".