81027271 has 4 divisors (see below), whose sum is σ = 87260152. Its totient is φ = 74794392.

The previous prime is 81027251. The next prime is 81027277. The reversal of 81027271 is 17272018.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 81027271 - 2⁵ = 81027239 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81027277) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3116421 + ... + 3116446.

It is an arithmetic number, because the mean of its divisors is an integer number (21815038).

Almost surely, 2^81027271 is an apocalyptic number.

81027271 is a deficient number, since it is larger than the sum of its proper divisors (6232881).

81027271 is a wasteful number, since it uses less digits than its factorization.

81027271 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6232880.

The product of its (nonzero) digits is 1568, while the sum is 28.

The square root of 81027271 is about 9001.5149280552. The cubic root of 81027271 is about 432.7234231599.

Adding to 81027271 its reverse (17272018), we get a palindrome (98299289).

The spelling of 81027271 in words is "eighty-one million, twenty-seven thousand, two hundred seventy-one".