81343441 has 2 divisors, whose sum is σ = 81343442. Its totient is φ = 81343440.

The previous prime is 81343397. The next prime is 81343469. The reversal of 81343441 is 14434318.

It is an a-pointer prime, because the next prime (81343469) can be obtained adding 81343441 to its sum of digits (28).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 46580625 + 34762816 = 6825^2 + 5896^2 .

It is a cyclic number.

It is not a de Polignac number, because 81343441 - 2⁹ = 81342929 is a prime.

It is not a weakly prime, because it can be changed into another prime (81341441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40671720 + 40671721.

It is an arithmetic number, because the mean of its divisors is an integer number (40671721).

Almost surely, 2^81343441 is an apocalyptic number.

It is an amenable number.

81343441 is a deficient number, since it is larger than the sum of its proper divisors (1).

81343441 is an equidigital number, since it uses as much as digits as its factorization.

81343441 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4608, while the sum is 28.

The square root of 81343441 is about 9019.0598734014. The cubic root of 81343441 is about 433.2855244428.

Adding to 81343441 its reverse (14434318), we get a palindrome (95777759).

The spelling of 81343441 in words is "eighty-one million, three hundred forty-three thousand, four hundred forty-one".