81282743 has 2 divisors, whose sum is σ = 81282744. Its totient is φ = 81282742.

The previous prime is 81282739. The next prime is 81282757. The reversal of 81282743 is 34728218.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81282743 - 2² = 81282739 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81288743) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40641371 + 40641372.

It is an arithmetic number, because the mean of its divisors is an integer number (40641372).

Almost surely, 2^81282743 is an apocalyptic number.

81282743 is a deficient number, since it is larger than the sum of its proper divisors (1).

81282743 is an equidigital number, since it uses as much as digits as its factorization.

81282743 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21504, while the sum is 35.

The square root of 81282743 is about 9015.6942605658. The cubic root of 81282743 is about 433.1777259173.

The spelling of 81282743 in words is "eighty-one million, two hundred eighty-two thousand, seven hundred forty-three".