81271243 has 8 divisors (see below), whose sum is σ = 84053376. Its totient is φ = 78499200.

The previous prime is 81271241. The next prime is 81271297. The reversal of 81271243 is 34217218.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 81271243 - 2¹ = 81271241 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81271241) 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 7 ways as a sum of consecutive naturals, for example, 16173 + ... + 20593.

It is an arithmetic number, because the mean of its divisors is an integer number (10506672).

Almost surely, 2^81271243 is an apocalyptic number.

81271243 is a deficient number, since it is larger than the sum of its proper divisors (2782133).

81271243 is a wasteful number, since it uses less digits than its factorization.

81271243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5045.

The product of its digits is 2688, while the sum is 28.

The square root of 81271243 is about 9015.0564612763. The cubic root of 81271243 is about 433.1572960835.

The spelling of 81271243 in words is "eighty-one million, two hundred seventy-one thousand, two hundred forty-three".