81008227 has 4 divisors (see below), whose sum is σ = 81591160. Its totient is φ = 80425296.

The previous prime is 81008219. The next prime is 81008233. The reversal of 81008227 is 72280018.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 81008227 - 2³ = 81008219 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 81008195 and 81008204.

It is not an unprimeable number, because it can be changed into a prime (81008287) 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, 291258 + ... + 291535.

It is an arithmetic number, because the mean of its divisors is an integer number (20397790).

Almost surely, 2^81008227 is an apocalyptic number.

81008227 is a deficient number, since it is larger than the sum of its proper divisors (582933).

81008227 is a wasteful number, since it uses less digits than its factorization.

81008227 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 582932.

The product of its (nonzero) digits is 1792, while the sum is 28.

The square root of 81008227 is about 9000.4570439506. The cubic root of 81008227 is about 432.6895192225.

The spelling of 81008227 in words is "eighty-one million, eight thousand, two hundred twenty-seven".