681333473 has 2 divisors, whose sum is σ = 681333474. Its totient is φ = 681333472.

The previous prime is 681333467. The next prime is 681333493. The reversal of 681333473 is 374333186.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 349802209 + 331531264 = 18703^2 + 18208^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-681333473 is a prime.

It is not a weakly prime, because it can be changed into another prime (681333493) 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, 340666736 + 340666737.

It is an arithmetic number, because the mean of its divisors is an integer number (340666737).

Almost surely, 2^681333473 is an apocalyptic number.

It is an amenable number.

681333473 is a deficient number, since it is larger than the sum of its proper divisors (1).

681333473 is an equidigital number, since it uses as much as digits as its factorization.

681333473 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 108864, while the sum is 38.

The square root of 681333473 is about 26102.3652759669. The cubic root of 681333473 is about 879.9403682905.

The spelling of 681333473 in words is "six hundred eighty-one million, three hundred thirty-three thousand, four hundred seventy-three".