81524573 has 16 divisors (see below), whose sum is σ = 92870400. Its totient is φ = 70943040.

The previous prime is 81524561. The next prime is 81524587. The reversal of 81524573 is 37542518.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 81524573 - 2²⁴ = 64747357 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81524533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 58343 + ... + 59723.

It is an arithmetic number, because the mean of its divisors is an integer number (5804400).

Almost surely, 2^81524573 is an apocalyptic number.

It is an amenable number.

81524573 is a deficient number, since it is larger than the sum of its proper divisors (11345827).

81524573 is a wasteful number, since it uses less digits than its factorization.

81524573 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1652.

The product of its digits is 33600, while the sum is 35.

The square root of 81524573 is about 9029.0959126593. The cubic root of 81524573 is about 433.6068930796.

The spelling of 81524573 in words is "eighty-one million, five hundred twenty-four thousand, five hundred seventy-three".