81108101 has 8 divisors (see below), whose sum is σ = 82685184. Its totient is φ = 79539120.

The previous prime is 81108089. The next prime is 81108113. The reversal of 81108101 is 10180118.

It is an interprime number because it is at equal distance from previous prime (81108089) and next prime (81108113).

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

It is not a de Polignac number, because 81108101 - 2¹⁰ = 81107077 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 (81108161) 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 7 ways as a sum of consecutive naturals, for example, 20576 + ... + 24198.

It is an arithmetic number, because the mean of its divisors is an integer number (10335648).

Almost surely, 2^81108101 is an apocalyptic number.

It is an amenable number.

81108101 is a deficient number, since it is larger than the sum of its proper divisors (1577083).

81108101 is a wasteful number, since it uses less digits than its factorization.

81108101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4051.

The product of its (nonzero) digits is 64, while the sum is 20.

The square root of 81108101 is about 9006.0036087046. The cubic root of 81108101 is about 432.8672653078.

Adding to 81108101 its reverse (10180118), we get a palindrome (91288219).

The spelling of 81108101 in words is "eighty-one million, one hundred eight thousand, one hundred one".