81081231026 has 16 divisors (see below), whose sum is σ = 128785780224. Its totient is φ = 38152997184.

The previous prime is 81081230969. The next prime is 81081231029. The reversal of 81081231026 is 62013218018.

It is a junction number, because it is equal to n+sod(n) for n = 81081230983 and 81081231001.

It is not an unprimeable number, because it can be changed into a prime (81081231029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 407711 + ... + 573053.

It is an arithmetic number, because the mean of its divisors is an integer number (8049111264).

Almost surely, 2^81081231026 is an apocalyptic number.

81081231026 is a deficient number, since it is larger than the sum of its proper divisors (47704549198).

81081231026 is a wasteful number, since it uses less digits than its factorization.

81081231026 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 179785.

The product of its (nonzero) digits is 4608, while the sum is 32.

The spelling of 81081231026 in words is "eighty-one billion, eighty-one million, two hundred thirty-one thousand, twenty-six".