81110082131 has 4 divisors (see below), whose sum is σ = 87349319232. Its totient is φ = 74870845032.

The previous prime is 81110082121. The next prime is 81110082187. The reversal of 81110082131 is 13128001118.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13128001118 = 2 ⋅6564000559.

It is a cyclic number.

It is not a de Polignac number, because 81110082131 - 2²⁶ = 81042973267 is a prime.

It is a super-2 number, since 2×81110082131² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 81110082131.

It is not an unprimeable number, because it can be changed into a prime (81110082121) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3119618531 + ... + 3119618556.

It is an arithmetic number, because the mean of its divisors is an integer number (21837329808).

Almost surely, 2^81110082131 is an apocalyptic number.

81110082131 is a deficient number, since it is larger than the sum of its proper divisors (6239237101).

81110082131 is a wasteful number, since it uses less digits than its factorization.

81110082131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6239237100.

The product of its (nonzero) digits is 384, while the sum is 26.

Adding to 81110082131 its reverse (13128001118), we get a palindrome (94238083249).

The spelling of 81110082131 in words is "eighty-one billion, one hundred ten million, eighty-two thousand, one hundred thirty-one".