81105910 has 8 divisors (see below), whose sum is σ = 145990656. Its totient is φ = 32442360.

The previous prime is 81105907. The next prime is 81105917. The reversal of 81105910 is 1950118.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81105917) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4055286 + ... + 4055305.

It is an arithmetic number, because the mean of its divisors is an integer number (18248832).

Almost surely, 2^81105910 is an apocalyptic number.

81105910 is a deficient number, since it is larger than the sum of its proper divisors (64884746).

81105910 is a wasteful number, since it uses less digits than its factorization.

81105910 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8110598.

The product of its (nonzero) digits is 360, while the sum is 25.

The square root of 81105910 is about 9005.8819668037. The cubic root of 81105910 is about 432.8633675438.

The spelling of 81105910 in words is "eighty-one million, one hundred five thousand, nine hundred ten".