81108303113 has 4 divisors (see below), whose sum is σ = 81131741508. Its totient is φ = 81084864720.

The previous prime is 81108303061. The next prime is 81108303181. The reversal of 81108303113 is 31130380118.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 24707752969 + 56400550144 = 157187^2 + 237488^2 .

It is a cyclic number.

It is not a de Polignac number, because 81108303113 - 2⁶ = 81108303049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81108303613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11714006 + ... + 11720927.

It is an arithmetic number, because the mean of its divisors is an integer number (20282935377).

Almost surely, 2^81108303113 is an apocalyptic number.

It is an amenable number.

81108303113 is a deficient number, since it is larger than the sum of its proper divisors (23438395).

81108303113 is a wasteful number, since it uses less digits than its factorization.

81108303113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23438394.

The product of its (nonzero) digits is 1728, while the sum is 29.

The spelling of 81108303113 in words is "eighty-one billion, one hundred eight million, three hundred three thousand, one hundred thirteen".