81016043 has 4 divisors (see below), whose sum is σ = 81040008. Its totient is φ = 80992080.

The previous prime is 81016031. The next prime is 81016063. The reversal of 81016043 is 34061018.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34061018 = 2 ⋅17030509.

It is a cyclic number.

It is not a de Polignac number, because 81016043 - 2⁸ = 81015787 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81016063) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5873 + ... + 14018.

It is an arithmetic number, because the mean of its divisors is an integer number (20260002).

Almost surely, 2^81016043 is an apocalyptic number.

81016043 is a deficient number, since it is larger than the sum of its proper divisors (23965).

81016043 is a wasteful number, since it uses less digits than its factorization.

81016043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23964.

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 81016043 is about 9000.8912336501. The cubic root of 81016043 is about 432.7034346508.

The spelling of 81016043 in words is "eighty-one million, sixteen thousand, forty-three".