81124585 has 16 divisors (see below), whose sum is σ = 104659200. Its totient is φ = 60172416.

The previous prime is 81124583. The next prime is 81124597. The reversal of 81124585 is 58542118.

It is a cyclic number.

It is not a de Polignac number, because 81124585 - 2¹ = 81124583 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 81124585.

It is not an unprimeable number, because it can be changed into a prime (81124583) 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, 4620 + ... + 13549.

It is an arithmetic number, because the mean of its divisors is an integer number (6541200).

Almost surely, 2^81124585 is an apocalyptic number.

It is an amenable number.

81124585 is a deficient number, since it is larger than the sum of its proper divisors (23534615).

81124585 is a wasteful number, since it uses less digits than its factorization.

81124585 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18240.

The product of its digits is 12800, while the sum is 34.

The square root of 81124585 is about 9006.9187295101. The cubic root of 81124585 is about 432.8965879056.

The spelling of 81124585 in words is "eighty-one million, one hundred twenty-four thousand, five hundred eighty-five".