681111443 has 24 divisors (see below), whose sum is σ = 772873728. Its totient is φ = 598663296.

The previous prime is 681111419. The next prime is 681111463. The reversal of 681111443 is 344111186.

It is not a de Polignac number, because 681111443 - 2²² = 676917139 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681111463) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 284630 + ... + 287012.

It is an arithmetic number, because the mean of its divisors is an integer number (32203072).

Almost surely, 2^681111443 is an apocalyptic number.

681111443 is a deficient number, since it is larger than the sum of its proper divisors (91762285).

681111443 is a wasteful number, since it uses less digits than its factorization.

681111443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2483 (or 2466 counting only the distinct ones).

The product of its digits is 2304, while the sum is 29.

The square root of 681111443 is about 26098.1118665700. Note that the first 3 decimals coincide. The cubic root of 681111443 is about 879.8447741877.

The spelling of 681111443 in words is "six hundred eighty-one million, one hundred eleven thousand, four hundred forty-three".