81327271 has 2 divisors, whose sum is σ = 81327272. Its totient is φ = 81327270.

The previous prime is 81327251. The next prime is 81327293. The reversal of 81327271 is 17272318.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81327271 - 2⁷ = 81327143 is a prime.

It is a super-2 number, since 2×81327271² = 13228250016614882, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81327251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40663635 + 40663636.

It is an arithmetic number, because the mean of its divisors is an integer number (40663636).

Almost surely, 2^81327271 is an apocalyptic number.

81327271 is a deficient number, since it is larger than the sum of its proper divisors (1).

81327271 is an equidigital number, since it uses as much as digits as its factorization.

81327271 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4704, while the sum is 31.

The square root of 81327271 is about 9018.1633939511. The cubic root of 81327271 is about 433.2568120634.

Adding to 81327271 its reverse (17272318), we get a palindrome (98599589).

The spelling of 81327271 in words is "eighty-one million, three hundred twenty-seven thousand, two hundred seventy-one".