81068525 has 6 divisors (see below), whose sum is σ = 100525002. Its totient is φ = 64854800.

The previous prime is 81068513. The next prime is 81068531. The reversal of 81068525 is 52586018.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 9259849 + 71808676 = 3043^2 + 8474^2 .

It is not a de Polignac number, because 81068525 - 2¹⁰ = 81067501 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 in 5 ways as a sum of consecutive naturals, for example, 1621346 + ... + 1621395.

It is an arithmetic number, because the mean of its divisors is an integer number (16754167).

Almost surely, 2^81068525 is an apocalyptic number.

It is an amenable number.

81068525 is a deficient number, since it is larger than the sum of its proper divisors (19456477).

81068525 is a wasteful number, since it uses less digits than its factorization.

81068525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3242751 (or 3242746 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 35.

The square root of 81068525 is about 9003.8061396278. The cubic root of 81068525 is about 432.7968492344.

The spelling of 81068525 in words is "eighty-one million, sixty-eight thousand, five hundred twenty-five".