81120334729 has 8 divisors (see below), whose sum is σ = 92779251840. Its totient is φ = 69478992096.

The previous prime is 81120334667. The next prime is 81120334739. The reversal of 81120334729 is 92743302118.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 81120334729 - 2¹¹ = 81120332681 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 81120334691 and 81120334700.

It is not an unprimeable number, because it can be changed into a prime (81120334739) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4383724 + ... + 4402189.

It is an arithmetic number, because the mean of its divisors is an integer number (11597406480).

Almost surely, 2^81120334729 is an apocalyptic number.

It is an amenable number.

81120334729 is a deficient number, since it is larger than the sum of its proper divisors (11658917111).

81120334729 is a wasteful number, since it uses less digits than its factorization.

81120334729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8787239.

The product of its (nonzero) digits is 72576, while the sum is 40.

The spelling of 81120334729 in words is "eighty-one billion, one hundred twenty million, three hundred thirty-four thousand, seven hundred twenty-nine".