81128027 has 2 divisors, whose sum is σ = 81128028. Its totient is φ = 81128026.

The previous prime is 81128017. The next prime is 81128077. The reversal of 81128027 is 72082118.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81128027 - 2¹⁶ = 81062491 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (81128017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40564013 + 40564014.

It is an arithmetic number, because the mean of its divisors is an integer number (40564014).

Almost surely, 2^81128027 is an apocalyptic number.

81128027 is a deficient number, since it is larger than the sum of its proper divisors (1).

81128027 is an equidigital number, since it uses as much as digits as its factorization.

81128027 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1792, while the sum is 29.

The square root of 81128027 is about 9007.1098028169. The cubic root of 81128027 is about 432.9027102132.

The spelling of 81128027 in words is "eighty-one million, one hundred twenty-eight thousand, twenty-seven".