81169055 has 16 divisors (see below), whose sum is σ = 106444800. Its totient is φ = 58928160.

The previous prime is 81169051. The next prime is 81169061. The reversal of 81169055 is 55096118.

It is not a de Polignac number, because 81169055 - 2² = 81169051 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81169051) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 45266 + ... + 47024.

It is an arithmetic number, because the mean of its divisors is an integer number (6652800).

Almost surely, 2^81169055 is an apocalyptic number.

81169055 is a deficient number, since it is larger than the sum of its proper divisors (25275745).

81169055 is a wasteful number, since it uses less digits than its factorization.

81169055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2614.

The product of its (nonzero) digits is 10800, while the sum is 35.

The square root of 81169055 is about 9009.3870490728. The cubic root of 81169055 is about 432.9756736507.

It can be divided in two parts, 8116 and 9055, that added together give a palindrome (17171).

The spelling of 81169055 in words is "eighty-one million, one hundred sixty-nine thousand, fifty-five".