681091471 has 2 divisors, whose sum is σ = 681091472. Its totient is φ = 681091470.

The previous prime is 681091459. The next prime is 681091501. The reversal of 681091471 is 174190186.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 681091471 - 2²¹ = 678994319 is a prime.

It is a super-3 number, since 3×681091471³ (a number of 27 digits) contains 333 as substring.

It is equal to p_35323597 and since 681091471 and 35323597 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 681091471.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (681091171) 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, 340545735 + 340545736.

It is an arithmetic number, because the mean of its divisors is an integer number (340545736).

Almost surely, 2^681091471 is an apocalyptic number.

681091471 is a deficient number, since it is larger than the sum of its proper divisors (1).

681091471 is an equidigital number, since it uses as much as digits as its factorization.

681091471 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12096, while the sum is 37.

The square root of 681091471 is about 26097.7292307204. The cubic root of 681091471 is about 879.8361743069.

The spelling of 681091471 in words is "six hundred eighty-one million, ninety-one thousand, four hundred seventy-one".