81078141171 has 4 divisors (see below), whose sum is σ = 108104188232. Its totient is φ = 54052094112.

The previous prime is 81078141169. The next prime is 81078141227. The reversal of 81078141171 is 17114187018.

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

It is not a de Polignac number, because 81078141171 - 2¹ = 81078141169 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81078141121) 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, 13513023526 + ... + 13513023531.

It is an arithmetic number, because the mean of its divisors is an integer number (27026047058).

Almost surely, 2^81078141171 is an apocalyptic number.

81078141171 is a deficient number, since it is larger than the sum of its proper divisors (27026047061).

81078141171 is a wasteful number, since it uses less digits than its factorization.

81078141171 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27026047060.

The product of its (nonzero) digits is 12544, while the sum is 39.

The spelling of 81078141171 in words is "eighty-one billion, seventy-eight million, one hundred forty-one thousand, one hundred seventy-one".