81043018 has 32 divisors (see below), whose sum is σ = 147456000. Its totient is φ = 32631984.

The previous prime is 81043013. The next prime is 81043031. The reversal of 81043018 is 81034018.

It is a junction number, because it is equal to n+sod(n) for n = 81042983 and 81043001.

It is not an unprimeable number, because it can be changed into a prime (81043013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32583 + ... + 34981.

It is an arithmetic number, because the mean of its divisors is an integer number (4608000).

Almost surely, 2^81043018 is an apocalyptic number.

81043018 is a deficient number, since it is larger than the sum of its proper divisors (66412982).

81043018 is a wasteful number, since it uses less digits than its factorization.

81043018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2554.

The product of its (nonzero) digits is 768, while the sum is 25.

The square root of 81043018 is about 9002.3895716637. The cubic root of 81043018 is about 432.7514534526.

The spelling of 81043018 in words is "eighty-one million, forty-three thousand, eighteen".