81288211 has 2 divisors, whose sum is σ = 81288212. Its totient is φ = 81288210.

The previous prime is 81288209. The next prime is 81288217. The reversal of 81288211 is 11288218.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81288211 - 2¹ = 81288209 is a prime.

Together with 81288209, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (81288217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40644105 + 40644106.

It is an arithmetic number, because the mean of its divisors is an integer number (40644106).

Almost surely, 2^81288211 is an apocalyptic number.

81288211 is a deficient number, since it is larger than the sum of its proper divisors (1).

81288211 is an equidigital number, since it uses as much as digits as its factorization.

81288211 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2048, while the sum is 31.

The square root of 81288211 is about 9015.9975044362. The cubic root of 81288211 is about 433.1874391832.

The spelling of 81288211 in words is "eighty-one million, two hundred eighty-eight thousand, two hundred eleven".