81227 has 4 divisors (see below), whose sum is σ = 83160. Its totient is φ = 79296.

The previous prime is 81223. The next prime is 81233. The reversal of 81227 is 72218.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 72218 = 2 ⋅36109.

It is a cyclic number.

It is not a de Polignac number, because 81227 - 2² = 81223 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 81199 and 81208.

It is not an unprimeable number, because it can be changed into a prime (81223) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 902 + ... + 987.

It is an arithmetic number, because the mean of its divisors is an integer number (20790).

2⁸¹²²⁷ is an apocalyptic number.

81227 is a deficient number, since it is larger than the sum of its proper divisors (1933).

81227 is a wasteful number, since it uses less digits than its factorization.

81227 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1932.

The product of its digits is 224, while the sum is 20.

The square root of 81227 is about 285.0035087503. The cubic root of 81227 is about 43.3078680097.

Subtracting from 81227 its product of digits (224), we obtain a triangular number (81003 = T₄₀₂).

Subtracting from 81227 its reverse (72218), we obtain a palindrome (9009).

The spelling of 81227 in words is "eighty-one thousand, two hundred twenty-seven".