81051343 has 2 divisors, whose sum is σ = 81051344. Its totient is φ = 81051342.

The previous prime is 81051337. The next prime is 81051361. The reversal of 81051343 is 34315018.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81051343 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81051743) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40525671 + 40525672.

It is an arithmetic number, because the mean of its divisors is an integer number (40525672).

Almost surely, 2^81051343 is an apocalyptic number.

81051343 is a deficient number, since it is larger than the sum of its proper divisors (1).

81051343 is an equidigital number, since it uses as much as digits as its factorization.

81051343 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 81051343 is about 9002.8519370253. The cubic root of 81051343 is about 432.7662708199.

The spelling of 81051343 in words is "eighty-one million, fifty-one thousand, three hundred forty-three".