81131413118 has 32 divisors (see below), whose sum is σ = 140517892800. Its totient is φ = 34412025600.

The previous prime is 81131413117. The next prime is 81131413157.

81131413118 is nontrivially palindromic in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81131413117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3825608 + ... + 3846756.

It is an arithmetic number, because the mean of its divisors is an integer number (4391184150).

Almost surely, 2^81131413118 is an apocalyptic number.

81131413118 is a deficient number, since it is larger than the sum of its proper divisors (59386479682).

81131413118 is a wasteful number, since it uses less digits than its factorization.

81131413118 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23972.

The product of its digits is 2304, while the sum is 32.

The spelling of 81131413118 in words is "eighty-one billion, one hundred thirty-one million, four hundred thirteen thousand, one hundred eighteen".