681443 has 6 divisors (see below), whose sum is σ = 792756. Its totient is φ = 584052.

The previous prime is 681427. The next prime is 681449. The reversal of 681443 is 344186.

It is not a de Polignac number, because 681443 - 2⁴ = 681427 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a plaindrome in base 6.

It is a zygodrome in base 6.

It is not an unprimeable number, because it can be changed into a prime (681449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6905 + ... + 7002.

It is an arithmetic number, because the mean of its divisors is an integer number (132126).

2⁶⁸¹⁴⁴³ is an apocalyptic number.

681443 is a deficient number, since it is larger than the sum of its proper divisors (111313).

681443 is a wasteful number, since it uses less digits than its factorization.

681443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13921 (or 13914 counting only the distinct ones).

The product of its digits is 2304, while the sum is 26.

The square root of 681443 is about 825.4956087103. The cubic root of 681443 is about 87.9987517041.

The spelling of 681443 in words is "six hundred eighty-one thousand, four hundred forty-three".