81113810371 has 4 divisors (see below), whose sum is σ = 88487793144. Its totient is φ = 73739827600.

The previous prime is 81113810359. The next prime is 81113810381. The reversal of 81113810371 is 17301831118.

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

It is a cyclic number.

It is not a de Polignac number, because 81113810371 - 2⁹ = 81113809859 is a prime.

It is a super-3 number, since 3×81113810371³ (a number of 34 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81113810321) 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, 3686991370 + ... + 3686991391.

It is an arithmetic number, because the mean of its divisors is an integer number (22121948286).

Almost surely, 2^81113810371 is an apocalyptic number.

81113810371 is a deficient number, since it is larger than the sum of its proper divisors (7373982773).

81113810371 is a wasteful number, since it uses less digits than its factorization.

81113810371 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7373982772.

The product of its (nonzero) digits is 4032, while the sum is 34.

The spelling of 81113810371 in words is "eighty-one billion, one hundred thirteen million, eight hundred ten thousand, three hundred seventy-one".