81582227 has 2 divisors, whose sum is σ = 81582228. Its totient is φ = 81582226.

The previous prime is 81582217. The next prime is 81582253. The reversal of 81582227 is 72228518.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81582227 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (81582217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40791113 + 40791114.

It is an arithmetic number, because the mean of its divisors is an integer number (40791114).

Almost surely, 2^81582227 is an apocalyptic number.

81582227 is a deficient number, since it is larger than the sum of its proper divisors (1).

81582227 is an equidigital number, since it uses as much as digits as its factorization.

81582227 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17920, while the sum is 35.

The square root of 81582227 is about 9032.2880268512. The cubic root of 81582227 is about 433.7090842762.

The spelling of 81582227 in words is "eighty-one million, five hundred eighty-two thousand, two hundred twenty-seven".