81105686 has 8 divisors (see below), whose sum is σ = 121726800. Its totient is φ = 40530088.

The previous prime is 81105683. The next prime is 81105709. The reversal of 81105686 is 68650118.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81105683) 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, 6506 + ... + 14301.

It is an arithmetic number, because the mean of its divisors is an integer number (15215850).

Almost surely, 2^81105686 is an apocalyptic number.

81105686 is a deficient number, since it is larger than the sum of its proper divisors (40621114).

81105686 is a wasteful number, since it uses less digits than its factorization.

81105686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22758.

The product of its (nonzero) digits is 11520, while the sum is 35.

The square root of 81105686 is about 9005.8695304784. The cubic root of 81105686 is about 432.8629690464.

It can be divided in two parts, 8 and 1105686, that multiplied together give a palindrome (8845488).

The spelling of 81105686 in words is "eighty-one million, one hundred five thousand, six hundred eighty-six".