81108911 has 8 divisors (see below), whose sum is σ = 90360480. Its totient is φ = 72287712.

The previous prime is 81108899. The next prime is 81108919. The reversal of 81108911 is 11980118.

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

It is a cyclic number.

It is not a de Polignac number, because 81108911 - 2¹⁴ = 81092527 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81108919) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 107195 + ... + 107948.

It is an arithmetic number, because the mean of its divisors is an integer number (11295060).

Almost surely, 2^81108911 is an apocalyptic number.

81108911 is a deficient number, since it is larger than the sum of its proper divisors (9251569).

81108911 is a wasteful number, since it uses less digits than its factorization.

81108911 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 215185.

The product of its (nonzero) digits is 576, while the sum is 29.

The square root of 81108911 is about 9006.0485785943. The cubic root of 81108911 is about 432.8687062708.

The spelling of 81108911 in words is "eighty-one million, one hundred eight thousand, nine hundred eleven".