81109071174 has 8 divisors (see below), whose sum is σ = 162218142360. Its totient is φ = 27036357056.

The previous prime is 81109071151. The next prime is 81109071179. The reversal of 81109071174 is 47117090118.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

81109071174 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81109071179) 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, 6759089259 + ... + 6759089270.

It is an arithmetic number, because the mean of its divisors is an integer number (20277267795).

Almost surely, 2^81109071174 is an apocalyptic number.

81109071174 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81109071174 is a wasteful number, since it uses less digits than its factorization.

81109071174 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13518178534.

The product of its (nonzero) digits is 14112, while the sum is 39.

The spelling of 81109071174 in words is "eighty-one billion, one hundred nine million, seventy-one thousand, one hundred seventy-four".