81935743 has 2 divisors, whose sum is σ = 81935744. Its totient is φ = 81935742.

The previous prime is 81935669. The next prime is 81935747. The reversal of 81935743 is 34753918.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81935743 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 81935696 and 81935705.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81935747) 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, 40967871 + 40967872.

It is an arithmetic number, because the mean of its divisors is an integer number (40967872).

Almost surely, 2^81935743 is an apocalyptic number.

81935743 is a deficient number, since it is larger than the sum of its proper divisors (1).

81935743 is an equidigital number, since it uses as much as digits as its factorization.

81935743 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 90720, while the sum is 40.

The square root of 81935743 is about 9051.8364435069. The cubic root of 81935743 is about 434.3346378866.

The spelling of 81935743 in words is "eighty-one million, nine hundred thirty-five thousand, seven hundred forty-three".