81032771 has 2 divisors, whose sum is σ = 81032772. Its totient is φ = 81032770.

The previous prime is 81032759. The next prime is 81032773. The reversal of 81032771 is 17723018.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81032771 - 2¹⁰ = 81031747 is a prime.

Together with 81032773, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (81032773) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40516385 + 40516386.

It is an arithmetic number, because the mean of its divisors is an integer number (40516386).

Almost surely, 2^81032771 is an apocalyptic number.

81032771 is a deficient number, since it is larger than the sum of its proper divisors (1).

81032771 is an equidigital number, since it uses as much as digits as its factorization.

81032771 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2352, while the sum is 29.

The square root of 81032771 is about 9001.8204270025. The cubic root of 81032771 is about 432.7332137936.

Adding to 81032771 its reverse (17723018), we get a palindrome (98755789).

The spelling of 81032771 in words is "eighty-one million, thirty-two thousand, seven hundred seventy-one".