81343697 has 2 divisors, whose sum is σ = 81343698. Its totient is φ = 81343696.

The previous prime is 81343679. The next prime is 81343733. The reversal of 81343697 is 79634318.

Together with previous prime (81343679) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 71301136 + 10042561 = 8444^2 + 3169^2 .

It is a cyclic number.

It is not a de Polignac number, because 81343697 - 2⁸ = 81343441 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (81343607) 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, 40671848 + 40671849.

It is an arithmetic number, because the mean of its divisors is an integer number (40671849).

Almost surely, 2^81343697 is an apocalyptic number.

It is an amenable number.

81343697 is a deficient number, since it is larger than the sum of its proper divisors (1).

81343697 is an equidigital number, since it uses as much as digits as its factorization.

81343697 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 108864, while the sum is 41.

The square root of 81343697 is about 9019.0740655568. The cubic root of 81343697 is about 433.2859789805.

The spelling of 81343697 in words is "eighty-one million, three hundred forty-three thousand, six hundred ninety-seven".