81927211 has 4 divisors (see below), whose sum is σ = 82103112. Its totient is φ = 81751312.

The previous prime is 81927193. The next prime is 81927217. The reversal of 81927211 is 11272918.

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 81927211 - 2⁹ = 81926699 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81927217) 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, 87250 + ... + 88183.

It is an arithmetic number, because the mean of its divisors is an integer number (20525778).

Almost surely, 2^81927211 is an apocalyptic number.

81927211 is a deficient number, since it is larger than the sum of its proper divisors (175901).

81927211 is a wasteful number, since it uses less digits than its factorization.

81927211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 175900.

The product of its digits is 2016, while the sum is 31.

The square root of 81927211 is about 9051.3651456562. The cubic root of 81927211 is about 434.3195615531.

The spelling of 81927211 in words is "eighty-one million, nine hundred twenty-seven thousand, two hundred eleven".