81031340743 has 16 divisors (see below), whose sum is σ = 82745220096. Its totient is φ = 79340526720.

The previous prime is 81031340737. The next prime is 81031340827. The reversal of 81031340743 is 34704313018.

It is a cyclic number.

It is not a de Polignac number, because 81031340743 - 2⁵ = 81031340711 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 81031340699 and 81031340708.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81031340723) 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 in 15 ways as a sum of consecutive naturals, for example, 3288796 + ... + 3313342.

It is an arithmetic number, because the mean of its divisors is an integer number (5171576256).

Almost surely, 2^81031340743 is an apocalyptic number.

81031340743 is a deficient number, since it is larger than the sum of its proper divisors (1713879353).

81031340743 is a wasteful number, since it uses less digits than its factorization.

81031340743 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25014.

The product of its (nonzero) digits is 24192, while the sum is 34.

The spelling of 81031340743 in words is "eighty-one billion, thirty-one million, three hundred forty thousand, seven hundred forty-three".