81110205 has 24 divisors (see below), whose sum is σ = 153372960. Its totient is φ = 39325920.

The previous prime is 81110153. The next prime is 81110207. The reversal of 81110205 is 50201118.

It is not a de Polignac number, because 81110205 - 2²⁵ = 47555773 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81110207) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 81435 + ... + 82424.

It is an arithmetic number, because the mean of its divisors is an integer number (6390540).

Almost surely, 2^81110205 is an apocalyptic number.

It is an amenable number.

81110205 is a deficient number, since it is larger than the sum of its proper divisors (72262755).

81110205 is a wasteful number, since it uses less digits than its factorization.

81110205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163881 (or 163878 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 18.

The square root of 81110205 is about 9006.1204189151. The cubic root of 81110205 is about 432.8710082338.

The spelling of 81110205 in words is "eighty-one million, one hundred ten thousand, two hundred five".