681727199 has 4 divisors (see below), whose sum is σ = 711367536. Its totient is φ = 652086864.

The previous prime is 681727187. The next prime is 681727229. The reversal of 681727199 is 991727186.

681727199 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-681727199 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681727159) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14820134 + ... + 14820179.

It is an arithmetic number, because the mean of its divisors is an integer number (177841884).

Almost surely, 2^681727199 is an apocalyptic number.

681727199 is a deficient number, since it is larger than the sum of its proper divisors (29640337).

681727199 is a wasteful number, since it uses less digits than its factorization.

681727199 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29640336.

The product of its digits is 381024, while the sum is 50.

The square root of 681727199 is about 26109.9061469014. The cubic root of 681727199 is about 880.1098343452.

The spelling of 681727199 in words is "six hundred eighty-one million, seven hundred twenty-seven thousand, one hundred ninety-nine".