81081105 has 32 divisors (see below), whose sum is σ = 148684800. Its totient is φ = 36960192.

The previous prime is 81081103. The next prime is 81081127. The reversal of 81081105 is 50118018.

It is not a de Polignac number, because 81081105 - 2¹ = 81081103 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81081103) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 45216 + ... + 46974.

It is an arithmetic number, because the mean of its divisors is an integer number (4646400).

Almost surely, 2^81081105 is an apocalyptic number.

It is an amenable number.

81081105 is a deficient number, since it is larger than the sum of its proper divisors (67603695).

81081105 is a wasteful number, since it uses less digits than its factorization.

81081105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2213.

The product of its (nonzero) digits is 320, while the sum is 24.

The square root of 81081105 is about 9004.5047059791. The cubic root of 81081105 is about 432.8192348346.

The spelling of 81081105 in words is "eighty-one million, eighty-one thousand, one hundred five".