81158871 has 16 divisors (see below), whose sum is σ = 111541248. Its totient is φ = 52452000.

The previous prime is 81158839. The next prime is 81158873. The reversal of 81158871 is 17885118.

It is not a de Polignac number, because 81158871 - 2⁵ = 81158839 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81158873) 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, 33346 + ... + 35696.

It is an arithmetic number, because the mean of its divisors is an integer number (6971328).

Almost surely, 2^81158871 is an apocalyptic number.

81158871 is a deficient number, since it is larger than the sum of its proper divisors (30382377).

81158871 is a wasteful number, since it uses less digits than its factorization.

81158871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2702.

The product of its digits is 17920, while the sum is 39.

The square root of 81158871 is about 9008.8218430603. The cubic root of 81158871 is about 432.9575649077.

The spelling of 81158871 in words is "eighty-one million, one hundred fifty-eight thousand, eight hundred seventy-one".