81055 has 16 divisors (see below), whose sum is σ = 110880. Its totient is φ = 56448.

The previous prime is 81049. The next prime is 81071. The reversal of 81055 is 55018.

81055 = T₅₈ + T₅₉ + ... + T₈₇.

It is a cyclic number.

It is not a de Polignac number, because 81055 - 2³ = 81047 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 (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1864 + ... + 1906.

It is an arithmetic number, because the mean of its divisors is an integer number (6930).

2⁸¹⁰⁵⁵ is an apocalyptic number.

81055 is a deficient number, since it is larger than the sum of its proper divisors (29825).

81055 is a wasteful number, since it uses less digits than its factorization.

81055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90.

The product of its (nonzero) digits is 200, while the sum is 19.

The square root of 81055 is about 284.7015981690. The cubic root of 81055 is about 43.2772779462.

The spelling of 81055 in words is "eighty-one thousand, fifty-five".