81143014571 has 4 divisors (see below), whose sum is σ = 81207466200. Its totient is φ = 81078562944.

The previous prime is 81143014549. The next prime is 81143014577. The reversal of 81143014571 is 17541034118.

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 81143014571 - 2¹⁴ = 81142998187 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81143014577) 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, 32223926 + ... + 32226443.

It is an arithmetic number, because the mean of its divisors is an integer number (20301866550).

Almost surely, 2^81143014571 is an apocalyptic number.

81143014571 is a deficient number, since it is larger than the sum of its proper divisors (64451629).

81143014571 is a wasteful number, since it uses less digits than its factorization.

81143014571 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64451628.

The product of its (nonzero) digits is 13440, while the sum is 35.

Adding to 81143014571 its reverse (17541034118), we get a palindrome (98684048689).

The spelling of 81143014571 in words is "eighty-one billion, one hundred forty-three million, fourteen thousand, five hundred seventy-one".