81033055 has 4 divisors (see below), whose sum is σ = 97239672. Its totient is φ = 64826440.

The previous prime is 81033041. The next prime is 81033059. The reversal of 81033055 is 55033018.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 81033055 - 2⁵ = 81033023 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81033059) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8103301 + ... + 8103310.

It is an arithmetic number, because the mean of its divisors is an integer number (24309918).

Almost surely, 2^81033055 is an apocalyptic number.

81033055 is a deficient number, since it is larger than the sum of its proper divisors (16206617).

81033055 is a wasteful number, since it uses less digits than its factorization.

81033055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16206616.

The product of its (nonzero) digits is 1800, while the sum is 25.

The square root of 81033055 is about 9001.8362015758. The cubic root of 81033055 is about 432.7337193342.

The spelling of 81033055 in words is "eighty-one million, thirty-three thousand, fifty-five".