81584043 has 16 divisors (see below), whose sum is σ = 114998400. Its totient is φ = 51304320.

The previous prime is 81584039. The next prime is 81584051. The reversal of 81584043 is 34048518.

It is not a de Polignac number, because 81584043 - 2² = 81584039 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 81583995 and 81584013.

It is not an unprimeable number, because it can be changed into a prime (81584053) 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, 10768 + ... + 16706.

It is an arithmetic number, because the mean of its divisors is an integer number (7187400).

Almost surely, 2^81584043 is an apocalyptic number.

81584043 is a deficient number, since it is larger than the sum of its proper divisors (33414357).

81584043 is a wasteful number, since it uses less digits than its factorization.

81584043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6202.

The product of its (nonzero) digits is 15360, while the sum is 33.

The square root of 81584043 is about 9032.3885545297. The cubic root of 81584043 is about 433.7123023377.

The spelling of 81584043 in words is "eighty-one million, five hundred eighty-four thousand, forty-three".