681809611 has 8 divisors (see below), whose sum is σ = 779508704. Its totient is φ = 584184960.

The previous prime is 681809587. The next prime is 681809617. The reversal of 681809611 is 116908186.

681809611 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 681809611 - 2⁷ = 681809483 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (681809617) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2641 + ... + 37021.

It is an arithmetic number, because the mean of its divisors is an integer number (97438588).

Almost surely, 2^681809611 is an apocalyptic number.

681809611 is a deficient number, since it is larger than the sum of its proper divisors (97699093).

681809611 is a wasteful number, since it uses less digits than its factorization.

681809611 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37221.

The product of its (nonzero) digits is 20736, while the sum is 40.

The square root of 681809611 is about 26111.4842741656. The cubic root of 681809611 is about 880.1452975477.

The spelling of 681809611 in words is "six hundred eighty-one million, eight hundred nine thousand, six hundred eleven".