81110745 has 24 divisors (see below), whose sum is σ = 140916672. Its totient is φ = 43159200.

The previous prime is 81110699. The next prime is 81110761. The reversal of 81110745 is 54701118.

It is not a de Polignac number, because 81110745 - 2⁶ = 81110681 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 20260 + ... + 23930.

It is an arithmetic number, because the mean of its divisors is an integer number (5871528).

Almost surely, 2^81110745 is an apocalyptic number.

It is an amenable number.

81110745 is a deficient number, since it is larger than the sum of its proper divisors (59805927).

81110745 is a wasteful number, since it uses less digits than its factorization.

81110745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4173 (or 4170 counting only the distinct ones).

The product of its (nonzero) digits is 1120, while the sum is 27.

The square root of 81110745 is about 9006.1503984777. The cubic root of 81110745 is about 432.8719688603.

The spelling of 81110745 in words is "eighty-one million, one hundred ten thousand, seven hundred forty-five".