81354743 has 2 divisors, whose sum is σ = 81354744. Its totient is φ = 81354742.

The previous prime is 81354737. The next prime is 81354761. The reversal of 81354743 is 34745318.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81354743 - 2⁴ = 81354727 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81354733) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40677371 + 40677372.

It is an arithmetic number, because the mean of its divisors is an integer number (40677372).

Almost surely, 2^81354743 is an apocalyptic number.

81354743 is a deficient number, since it is larger than the sum of its proper divisors (1).

81354743 is an equidigital number, since it uses as much as digits as its factorization.

81354743 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 40320, while the sum is 35.

The square root of 81354743 is about 9019.6864136177. The cubic root of 81354743 is about 433.3055906631.

The spelling of 81354743 in words is "eighty-one million, three hundred fifty-four thousand, seven hundred forty-three".