681336833 has 4 divisors (see below), whose sum is σ = 699751380. Its totient is φ = 662922288.

The previous prime is 681336793. The next prime is 681336841. The reversal of 681336833 is 338633186.

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

It can be written as a sum of positive squares in 2 ways, for example, as 425720689 + 255616144 = 20633^2 + 15988^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-681336833 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (681336883) 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, 9207218 + ... + 9207291.

It is an arithmetic number, because the mean of its divisors is an integer number (174937845).

Almost surely, 2^681336833 is an apocalyptic number.

It is an amenable number.

681336833 is a deficient number, since it is larger than the sum of its proper divisors (18414547).

681336833 is a wasteful number, since it uses less digits than its factorization.

681336833 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18414546.

The product of its digits is 186624, while the sum is 41.

The square root of 681336833 is about 26102.4296378709. The cubic root of 681336833 is about 879.9418147652.

The spelling of 681336833 in words is "six hundred eighty-one million, three hundred thirty-six thousand, eight hundred thirty-three".