8181443 has 4 divisors (see below), whose sum is σ = 8192208. Its totient is φ = 8170680.

The previous prime is 8181421. The next prime is 8181449. The reversal of 8181443 is 3441818.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3441818 = 2 ⋅1720909.

It is a cyclic number.

It is not a de Polignac number, because 8181443 - 2⁶ = 8181379 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8181449) 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, 4148 + ... + 5793.

It is an arithmetic number, because the mean of its divisors is an integer number (2048052).

Almost surely, 2^8181443 is an apocalyptic number.

8181443 is a deficient number, since it is larger than the sum of its proper divisors (10765).

8181443 is an equidigital number, since it uses as much as digits as its factorization.

8181443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10764.

The product of its digits is 3072, while the sum is 29.

The square root of 8181443 is about 2860.3221846498. The cubic root of 8181443 is about 201.5007357940.

The spelling of 8181443 in words is "eight million, one hundred eighty-one thousand, four hundred forty-three".