81322271 has 8 divisors (see below), whose sum is σ = 86960304. Its totient is φ = 75779200.

The previous prime is 81322259. The next prime is 81322277. The reversal of 81322271 is 17222318.

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

It is not a de Polignac number, because 81322271 - 2¹⁸ = 81060127 is a prime.

It is a super-2 number, since 2×81322271² = 13226623521194882, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 81322271.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81322277) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21965 + ... + 25398.

It is an arithmetic number, because the mean of its divisors is an integer number (10870038).

Almost surely, 2^81322271 is an apocalyptic number.

81322271 is a deficient number, since it is larger than the sum of its proper divisors (5638033).

81322271 is a wasteful number, since it uses less digits than its factorization.

81322271 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47481.

The product of its digits is 1344, while the sum is 26.

The square root of 81322271 is about 9017.8861713818. The cubic root of 81322271 is about 433.2479330062.

Adding to 81322271 its reverse (17222318), we get a palindrome (98544589).

The spelling of 81322271 in words is "eighty-one million, three hundred twenty-two thousand, two hundred seventy-one".