81597743 has 2 divisors, whose sum is σ = 81597744. Its totient is φ = 81597742.

The previous prime is 81597713. The next prime is 81597811. The reversal of 81597743 is 34779518.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81597743 - 2¹² = 81593647 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 81597694 and 81597703.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81597713) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40798871 + 40798872.

It is an arithmetic number, because the mean of its divisors is an integer number (40798872).

Almost surely, 2^81597743 is an apocalyptic number.

81597743 is a deficient number, since it is larger than the sum of its proper divisors (1).

81597743 is an equidigital number, since it uses as much as digits as its factorization.

81597743 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 211680, while the sum is 44.

The square root of 81597743 is about 9033.1469045953. The cubic root of 81597743 is about 433.7365780243.

The spelling of 81597743 in words is "eighty-one million, five hundred ninety-seven thousand, seven hundred forty-three".