681396697 has 2 divisors, whose sum is σ = 681396698. Its totient is φ = 681396696.

The previous prime is 681396691. The next prime is 681396713. The reversal of 681396697 is 796693186.

681396697 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., 506205001 + 175191696 = 22499^2 + 13236^2 .

It is a cyclic number.

It is not a de Polignac number, because 681396697 - 2¹⁵ = 681363929 is a prime.

It is not a weakly prime, because it can be changed into another prime (681396691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340698348 + 340698349.

It is an arithmetic number, because the mean of its divisors is an integer number (340698349).

Almost surely, 2^681396697 is an apocalyptic number.

It is an amenable number.

681396697 is a deficient number, since it is larger than the sum of its proper divisors (1).

681396697 is an equidigital number, since it uses as much as digits as its factorization.

681396697 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2939328, while the sum is 55.

The square root of 681396697 is about 26103.5763258600. The cubic root of 681396697 is about 879.9675853246.

The spelling of 681396697 in words is "six hundred eighty-one million, three hundred ninety-six thousand, six hundred ninety-seven".