81803085 has 32 divisors (see below), whose sum is σ = 161091840. Its totient is φ = 34518528.

The previous prime is 81803069. The next prime is 81803093. The reversal of 81803085 is 58030818.

It is not a de Polignac number, because 81803085 - 2⁴ = 81803069 is a prime.

It is a congruent number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 28600 + ... + 31329.

It is an arithmetic number, because the mean of its divisors is an integer number (5034120).

Almost surely, 2^81803085 is an apocalyptic number.

It is an amenable number.

81803085 is a deficient number, since it is larger than the sum of its proper divisors (79288755).

81803085 is a wasteful number, since it uses less digits than its factorization.

81803085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59957.

The product of its (nonzero) digits is 7680, while the sum is 33.

The square root of 81803085 is about 9044.5057908102. The cubic root of 81803085 is about 434.1001082185.

The spelling of 81803085 in words is "eighty-one million, eight hundred three thousand, eighty-five".