81144524 has 6 divisors (see below), whose sum is σ = 142002924. Its totient is φ = 40572260.

The previous prime is 81144517. The next prime is 81144527. The reversal of 81144524 is 42544118.

It is not an unprimeable number, because it can be changed into a prime (81144527) 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 as a sum of consecutive naturals, namely, 10143062 + ... + 10143069.

It is an arithmetic number, because the mean of its divisors is an integer number (23667154).

Almost surely, 2^81144524 is an apocalyptic number.

It is an amenable number.

81144524 is a deficient number, since it is larger than the sum of its proper divisors (60858400).

81144524 is a wasteful number, since it uses less digits than its factorization.

81144524 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20286135 (or 20286133 counting only the distinct ones).

The product of its digits is 5120, while the sum is 29.

The square root of 81144524 is about 9008.0255328235. The cubic root of 81144524 is about 432.9320511297.

The spelling of 81144524 in words is "eighty-one million, one hundred forty-four thousand, five hundred twenty-four".