681313667 has 2 divisors, whose sum is σ = 681313668. Its totient is φ = 681313666.

The previous prime is 681313663. The next prime is 681313681. The reversal of 681313667 is 766313186.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 681313667 - 2² = 681313663 is a prime.

It is not a weakly prime, because it can be changed into another prime (681313663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340656833 + 340656834.

It is an arithmetic number, because the mean of its divisors is an integer number (340656834).

Almost surely, 2^681313667 is an apocalyptic number.

681313667 is a deficient number, since it is larger than the sum of its proper divisors (1).

681313667 is an equidigital number, since it uses as much as digits as its factorization.

681313667 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 108864, while the sum is 41.

The square root of 681313667 is about 26101.9858823041. The cubic root of 681313667 is about 879.9318417425.

The spelling of 681313667 in words is "six hundred eighty-one million, three hundred thirteen thousand, six hundred sixty-seven".