81032871 has 16 divisors (see below), whose sum is σ = 109177344. Its totient is φ = 53458944.

The previous prime is 81032867. The next prime is 81032893. The reversal of 81032871 is 17823018.

It is a happy number.

It is not a de Polignac number, because 81032871 - 2² = 81032867 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81032821) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 174786 + ... + 175248.

It is an arithmetic number, because the mean of its divisors is an integer number (6823584).

Almost surely, 2^81032871 is an apocalyptic number.

81032871 is a deficient number, since it is larger than the sum of its proper divisors (28144473).

81032871 is a wasteful number, since it uses less digits than its factorization.

81032871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 950.

The product of its (nonzero) digits is 2688, while the sum is 30.

The square root of 81032871 is about 9001.8259814329. The cubic root of 81032871 is about 432.7333918010.

Adding to 81032871 its reverse (17823018), we get a palindrome (98855889).

The spelling of 81032871 in words is "eighty-one million, thirty-two thousand, eight hundred seventy-one".