81271559 has 2 divisors, whose sum is σ = 81271560. Its totient is φ = 81271558.

The previous prime is 81271537. The next prime is 81271571. The reversal of 81271559 is 95517218.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81271559 - 2¹⁶ = 81206023 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81271859) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40635779 + 40635780.

It is an arithmetic number, because the mean of its divisors is an integer number (40635780).

Almost surely, 2^81271559 is an apocalyptic number.

81271559 is a deficient number, since it is larger than the sum of its proper divisors (1).

81271559 is an equidigital number, since it uses as much as digits as its factorization.

81271559 is an evil number, because the sum of its binary digits is even.

The product of its digits is 25200, while the sum is 38.

The square root of 81271559 is about 9015.0739874945. The cubic root of 81271559 is about 433.1578574855.

The spelling of 81271559 in words is "eighty-one million, two hundred seventy-one thousand, five hundred fifty-nine".