81086759 has 4 divisors (see below), whose sum is σ = 87324216. Its totient is φ = 74849304.

The previous prime is 81086749. The next prime is 81086771. The reversal of 81086759 is 95768018.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 81086759 - 2¹⁶ = 81021223 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 (81086749) 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 in 3 ways as a sum of consecutive naturals, for example, 3118709 + ... + 3118734.

It is an arithmetic number, because the mean of its divisors is an integer number (21831054).

Almost surely, 2^81086759 is an apocalyptic number.

81086759 is a deficient number, since it is larger than the sum of its proper divisors (6237457).

81086759 is a wasteful number, since it uses less digits than its factorization.

81086759 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6237456.

The product of its (nonzero) digits is 120960, while the sum is 44.

The square root of 81086759 is about 9004.8186544761. The cubic root of 81086759 is about 432.8292951443.

The spelling of 81086759 in words is "eighty-one million, eighty-six thousand, seven hundred fifty-nine".