81271571 has 2 divisors, whose sum is σ = 81271572. Its totient is φ = 81271570.

The previous prime is 81271559. The next prime is 81271583. The reversal of 81271571 is 17517218.

It is a balanced prime because it is at equal distance from previous prime (81271559) and next prime (81271583).

It is a cyclic number.

It is not a de Polignac number, because 81271571 - 2¹⁰ = 81270547 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (81271501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40635785 + 40635786.

It is an arithmetic number, because the mean of its divisors is an integer number (40635786).

Almost surely, 2^81271571 is an apocalyptic number.

81271571 is a deficient number, since it is larger than the sum of its proper divisors (1).

81271571 is an equidigital number, since it uses as much as digits as its factorization.

81271571 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3920, while the sum is 32.

The square root of 81271571 is about 9015.0746530464. The cubic root of 81271571 is about 433.1578788045.

Adding to 81271571 its reverse (17517218), we get a palindrome (98788789).

The spelling of 81271571 in words is "eighty-one million, two hundred seventy-one thousand, five hundred seventy-one".