81063171 has 24 divisors (see below), whose sum is σ = 138138624. Its totient is φ = 44826480.

The previous prime is 81063167. The next prime is 81063179. The reversal of 81063171 is 17136018.

It is not a de Polignac number, because 81063171 - 2² = 81063167 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81063179) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 18801 + ... + 22706.

It is an arithmetic number, because the mean of its divisors is an integer number (5755776).

Almost surely, 2^81063171 is an apocalyptic number.

81063171 is a deficient number, since it is larger than the sum of its proper divisors (57075453).

81063171 is a wasteful number, since it uses less digits than its factorization.

81063171 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41551 (or 41548 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 27.

The square root of 81063171 is about 9003.5088160117. The cubic root of 81063171 is about 432.7873213059.

Adding to 81063171 its reverse (17136018), we get a palindrome (98199189).

The spelling of 81063171 in words is "eighty-one million, sixty-three thousand, one hundred seventy-one".