81271793054 has 4 divisors (see below), whose sum is σ = 121907689584. Its totient is φ = 40635896526.

The previous prime is 81271793051. The next prime is 81271793069. The reversal of 81271793054 is 45039717218.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 45039717218 = 2 ⋅22519858609.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81271793051) 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 as a sum of consecutive naturals, namely, 20317948262 + ... + 20317948265.

It is an arithmetic number, because the mean of its divisors is an integer number (30476922396).

Almost surely, 2^81271793054 is an apocalyptic number.

81271793054 is a deficient number, since it is larger than the sum of its proper divisors (40635896530).

81271793054 is a wasteful number, since it uses less digits than its factorization.

81271793054 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40635896529.

The product of its (nonzero) digits is 423360, while the sum is 47.

The spelling of 81271793054 in words is "eighty-one billion, two hundred seventy-one million, seven hundred ninety-three thousand, fifty-four".