681207823 has 2 divisors, whose sum is σ = 681207824. Its totient is φ = 681207822.

The previous prime is 681207773. The next prime is 681207829. The reversal of 681207823 is 328702186.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 681207823 - 2¹⁷ = 681076751 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (681207829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340603911 + 340603912.

It is an arithmetic number, because the mean of its divisors is an integer number (340603912).

Almost surely, 2^681207823 is an apocalyptic number.

681207823 is a deficient number, since it is larger than the sum of its proper divisors (1).

681207823 is an equidigital number, since it uses as much as digits as its factorization.

681207823 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32256, while the sum is 37.

The square root of 681207823 is about 26099.9582949858. The cubic root of 681207823 is about 879.8862727514.

The spelling of 681207823 in words is "six hundred eighty-one million, two hundred seven thousand, eight hundred twenty-three".