81599271 has 16 divisors (see below), whose sum is σ = 117457536. Its totient is φ = 50090976.

The previous prime is 81599261. The next prime is 81599321. The reversal of 81599271 is 17299518.

It is not a de Polignac number, because 81599271 - 2¹⁵ = 81566503 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81599261) 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, 14916 + ... + 19638.

It is an arithmetic number, because the mean of its divisors is an integer number (7341096).

Almost surely, 2^81599271 is an apocalyptic number.

81599271 is a deficient number, since it is larger than the sum of its proper divisors (35858265).

81599271 is a wasteful number, since it uses less digits than its factorization.

81599271 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5182.

The product of its digits is 45360, while the sum is 42.

The square root of 81599271 is about 9033.2314815906. The cubic root of 81599271 is about 433.7392853923.

The spelling of 81599271 in words is "eighty-one million, five hundred ninety-nine thousand, two hundred seventy-one".