681108805 has 8 divisors (see below), whose sum is σ = 880202232. Its totient is φ = 502972608.

The previous prime is 681108787. The next prime is 681108809. The reversal of 681108805 is 508801186.

It can be written as a sum of positive squares in 4 ways, for example, as 35593156 + 645515649 = 5966^2 + 25407^2 .

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 681108805 - 2⁹ = 681108293 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681108809) 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 in 7 ways as a sum of consecutive naturals, for example, 5239234 + ... + 5239363.

It is an arithmetic number, because the mean of its divisors is an integer number (110025279).

Almost surely, 2^681108805 is an apocalyptic number.

681108805 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

681108805 is a deficient number, since it is larger than the sum of its proper divisors (199093427).

681108805 is a wasteful number, since it uses less digits than its factorization.

681108805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10478615.

The product of its (nonzero) digits is 15360, while the sum is 37.

The square root of 681108805 is about 26098.0613264664. The cubic root of 681108805 is about 879.8436382828.

The spelling of 681108805 in words is "six hundred eighty-one million, one hundred eight thousand, eight hundred five".