681246697 has 2 divisors, whose sum is σ = 681246698. Its totient is φ = 681246696.

The previous prime is 681246689. The next prime is 681246751. The reversal of 681246697 is 796642186.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 442513296 + 238733401 = 21036^2 + 15451^2 .

It is a cyclic number.

It is not a de Polignac number, because 681246697 - 2³ = 681246689 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 681246697.

It is not a weakly prime, because it can be changed into another prime (681246667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340623348 + 340623349.

It is an arithmetic number, because the mean of its divisors is an integer number (340623349).

Almost surely, 2^681246697 is an apocalyptic number.

It is an amenable number.

681246697 is a deficient number, since it is larger than the sum of its proper divisors (1).

681246697 is an equidigital number, since it uses as much as digits as its factorization.

681246697 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 870912, while the sum is 49.

The square root of 681246697 is about 26100.7029981953. The cubic root of 681246697 is about 879.9030097134.

The spelling of 681246697 in words is "six hundred eighty-one million, two hundred forty-six thousand, six hundred ninety-seven".