81027071 has 2 divisors, whose sum is σ = 81027072. Its totient is φ = 81027070.

The previous prime is 81027047. The next prime is 81027109. The reversal of 81027071 is 17072018.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81027071 - 2¹⁴ = 81010687 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 81027071.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81027031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40513535 + 40513536.

It is an arithmetic number, because the mean of its divisors is an integer number (40513536).

Almost surely, 2^81027071 is an apocalyptic number.

81027071 is a deficient number, since it is larger than the sum of its proper divisors (1).

81027071 is an equidigital number, since it uses as much as digits as its factorization.

81027071 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 784, while the sum is 26.

The square root of 81027071 is about 9001.5038188072. The cubic root of 81027071 is about 432.7230671285.

Adding to 81027071 its reverse (17072018), we get a palindrome (98099089).

The spelling of 81027071 in words is "eighty-one million, twenty-seven thousand, seventy-one".