81343771 has 2 divisors, whose sum is σ = 81343772. Its totient is φ = 81343770.

The previous prime is 81343763. The next prime is 81343849. The reversal of 81343771 is 17734318.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81343771 - 2³ = 81343763 is a prime.

It is not a weakly prime, because it can be changed into another prime (81340771) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40671885 + 40671886.

It is an arithmetic number, because the mean of its divisors is an integer number (40671886).

Almost surely, 2^81343771 is an apocalyptic number.

81343771 is a deficient number, since it is larger than the sum of its proper divisors (1).

81343771 is an equidigital number, since it uses as much as digits as its factorization.

81343771 is an evil number, because the sum of its binary digits is even.

The product of its digits is 14112, while the sum is 34.

The square root of 81343771 is about 9019.0781679726. The cubic root of 81343771 is about 433.2861103701.

The spelling of 81343771 in words is "eighty-one million, three hundred forty-three thousand, seven hundred seventy-one".