81343051 has 2 divisors, whose sum is σ = 81343052. Its totient is φ = 81343050.

The previous prime is 81343049. The next prime is 81343069. The reversal of 81343051 is 15034318.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81343051 - 2¹ = 81343049 is a prime.

Together with 81343049, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (81343021) 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, 40671525 + 40671526.

It is an arithmetic number, because the mean of its divisors is an integer number (40671526).

Almost surely, 2^81343051 is an apocalyptic number.

81343051 is a deficient number, since it is larger than the sum of its proper divisors (1).

81343051 is an equidigital number, since it uses as much as digits as its factorization.

81343051 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 81343051 is about 9019.0382524968. The cubic root of 81343051 is about 433.2848319812.

Adding to 81343051 its reverse (15034318), we get a palindrome (96377369).

The spelling of 81343051 in words is "eighty-one million, three hundred forty-three thousand, fifty-one".