81108975 has 24 divisors (see below), whose sum is σ = 135494800. Its totient is φ = 42808320.

The previous prime is 81108961. The next prime is 81108977. The reversal of 81108975 is 57980118.

It is not a de Polignac number, because 81108975 - 2⁸ = 81108719 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81108977) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1701 + ... + 12849.

Almost surely, 2^81108975 is an apocalyptic number.

81108975 is a deficient number, since it is larger than the sum of its proper divisors (54385825).

81108975 is a wasteful number, since it uses less digits than its factorization.

81108975 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11259 (or 11254 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 39.

The square root of 81108975 is about 9006.0521317612. The cubic root of 81108975 is about 432.8688201243.

The spelling of 81108975 in words is "eighty-one million, one hundred eight thousand, nine hundred seventy-five".