81101611 has 16 divisors (see below), whose sum is σ = 92510208. Its totient is φ = 70646400.

The previous prime is 81101609. The next prime is 81101621. The reversal of 81101611 is 11610118.

It is a cyclic number.

It is not a de Polignac number, because 81101611 - 2¹ = 81101609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81101621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8776 + ... + 15466.

It is an arithmetic number, because the mean of its divisors is an integer number (5781888).

Almost surely, 2^81101611 is an apocalyptic number.

81101611 is a deficient number, since it is larger than the sum of its proper divisors (11408597).

81101611 is a wasteful number, since it uses less digits than its factorization.

81101611 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6762.

The product of its (nonzero) digits is 48, while the sum is 19.

The square root of 81101611 is about 9005.6432862955. The cubic root of 81101611 is about 432.8557194678.

Adding to 81101611 its reverse (11610118), we get a palindrome (92711729).

The spelling of 81101611 in words is "eighty-one million, one hundred one thousand, six hundred eleven".