81120334071 has 64 divisors (see below), whose sum is σ = 130998067200. Its totient is φ = 43665181056.

The previous prime is 81120334063. The next prime is 81120334079. The reversal of 81120334071 is 17043302118.

It is an interprime number because it is at equal distance from previous prime (81120334063) and next prime (81120334079).

It is not a de Polignac number, because 81120334071 - 2³ = 81120334063 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81120334079) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 40824540 + ... + 40826526.

It is an arithmetic number, because the mean of its divisors is an integer number (2046844800).

Almost surely, 2^81120334071 is an apocalyptic number.

81120334071 is a deficient number, since it is larger than the sum of its proper divisors (49877733129).

81120334071 is a wasteful number, since it uses less digits than its factorization.

81120334071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3628.

The product of its (nonzero) digits is 4032, while the sum is 30.

Adding to 81120334071 its reverse (17043302118), we get a palindrome (98163636189).

The spelling of 81120334071 in words is "eighty-one billion, one hundred twenty million, three hundred thirty-four thousand, seventy-one".