681365443 has 8 divisors (see below), whose sum is σ = 743533056. Its totient is φ = 619235400.

The previous prime is 681365437. The next prime is 681365459. The reversal of 681365443 is 344563186.

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 681365443 - 2¹⁷ = 681234371 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 681365396 and 681365405.

It is not an unprimeable number, because it can be changed into a prime (681365413) 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, 39730 + ... + 54232.

It is an arithmetic number, because the mean of its divisors is an integer number (92941632).

Almost surely, 2^681365443 is an apocalyptic number.

681365443 is a deficient number, since it is larger than the sum of its proper divisors (62167613).

681365443 is a wasteful number, since it uses less digits than its factorization.

681365443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18785.

The product of its digits is 207360, while the sum is 40.

The square root of 681365443 is about 26102.9776653929. The cubic root of 681365443 is about 879.9541311319.

The spelling of 681365443 in words is "six hundred eighty-one million, three hundred sixty-five thousand, four hundred forty-three".