81082011 has 8 divisors (see below), whose sum is σ = 108328000. Its totient is φ = 53945352.

The previous prime is 81081991. The next prime is 81082021. The reversal of 81082011 is 11028018.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 81082011 - 2¹⁸ = 80819867 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81082021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25585 + ... + 28578.

It is an arithmetic number, because the mean of its divisors is an integer number (13541000).

Almost surely, 2^81082011 is an apocalyptic number.

81082011 is a deficient number, since it is larger than the sum of its proper divisors (27245989).

81082011 is a wasteful number, since it uses less digits than its factorization.

81082011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54665.

The product of its (nonzero) digits is 128, while the sum is 21.

The square root of 81082011 is about 9004.5550139915. Note that the first 3 decimals coincide. The cubic root of 81082011 is about 432.8208469355.

The spelling of 81082011 in words is "eighty-one million, eighty-two thousand, eleven".