685394461 has 2 divisors, whose sum is σ = 685394462. Its totient is φ = 685394460.

The previous prime is 685394419. The next prime is 685394471. The reversal of 685394461 is 164493586.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 625950361 + 59444100 = 25019^2 + 7710^2 .

It is a cyclic number.

It is not a de Polignac number, because 685394461 - 2¹¹ = 685392413 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (685394471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 342697230 + 342697231.

It is an arithmetic number, because the mean of its divisors is an integer number (342697231).

Almost surely, 2^685394461 is an apocalyptic number.

It is an amenable number.

685394461 is a deficient number, since it is larger than the sum of its proper divisors (1).

685394461 is an equidigital number, since it uses as much as digits as its factorization.

685394461 is an evil number, because the sum of its binary digits is even.

The product of its digits is 622080, while the sum is 46.

The square root of 685394461 is about 26180.0393620789. The cubic root of 685394461 is about 881.6851580811.

The spelling of 685394461 in words is "six hundred eighty-five million, three hundred ninety-four thousand, four hundred sixty-one".