681875669 has 2 divisors, whose sum is σ = 681875670. Its totient is φ = 681875668.

The previous prime is 681875653. The next prime is 681875713. The reversal of 681875669 is 966578186.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 558376900 + 123498769 = 23630^2 + 11113^2 .

It is a cyclic number.

It is not a de Polignac number, because 681875669 - 2⁴ = 681875653 is a prime.

It is a super-3 number, since 3×681875669³ (a number of 27 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (681875609) 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, 340937834 + 340937835.

It is an arithmetic number, because the mean of its divisors is an integer number (340937835).

Almost surely, 2^681875669 is an apocalyptic number.

It is an amenable number.

681875669 is a deficient number, since it is larger than the sum of its proper divisors (1).

681875669 is an equidigital number, since it uses as much as digits as its factorization.

681875669 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4354560, while the sum is 56.

The square root of 681875669 is about 26112.7491658768. The cubic root of 681875669 is about 880.1737212991.

The spelling of 681875669 in words is "six hundred eighty-one million, eight hundred seventy-five thousand, six hundred sixty-nine".