81063861 has 16 divisors (see below), whose sum is σ = 116198400. Its totient is φ = 50107248.

The previous prime is 81063841. The next prime is 81063869. The reversal of 81063861 is 16836018.

It is not a de Polignac number, because 81063861 - 2⁹ = 81063349 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81063869) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12451 + ... + 17808.

It is an arithmetic number, because the mean of its divisors is an integer number (7262400).

Almost surely, 2^81063861 is an apocalyptic number.

It is an amenable number.

81063861 is a deficient number, since it is larger than the sum of its proper divisors (35134539).

81063861 is a wasteful number, since it uses less digits than its factorization.

81063861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30328.

The product of its (nonzero) digits is 6912, while the sum is 33.

The square root of 81063861 is about 9003.5471343243. The cubic root of 81063861 is about 432.7885492470.

Adding to 81063861 its reverse (16836018), we get a palindrome (97899879).

The spelling of 81063861 in words is "eighty-one million, sixty-three thousand, eight hundred sixty-one".