81441043 has 2 divisors, whose sum is σ = 81441044. Its totient is φ = 81441042.

The previous prime is 81441029. The next prime is 81441071. The reversal of 81441043 is 34014418.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81441043 - 2⁹ = 81440531 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 81440999 and 81441017.

It is not a weakly prime, because it can be changed into another prime (81441013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40720521 + 40720522.

It is an arithmetic number, because the mean of its divisors is an integer number (40720522).

Almost surely, 2^81441043 is an apocalyptic number.

81441043 is a deficient number, since it is larger than the sum of its proper divisors (1).

81441043 is an equidigital number, since it uses as much as digits as its factorization.

81441043 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1536, while the sum is 25.

The square root of 81441043 is about 9024.4691256605. The cubic root of 81441043 is about 433.4587514027.

The spelling of 81441043 in words is "eighty-one million, four hundred forty-one thousand, forty-three".