81105006 has 8 divisors (see below), whose sum is σ = 162210024. Its totient is φ = 27035000.

The previous prime is 81104993. The next prime is 81105019. The reversal of 81105006 is 60050118.

It is an interprime number because it is at equal distance from previous prime (81104993) and next prime (81105019).

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

81105006 is an admirable number.

It is a congruent number.

It is an unprimeable number.

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, 6758745 + ... + 6758756.

It is an arithmetic number, because the mean of its divisors is an integer number (20276253).

Almost surely, 2^81105006 is an apocalyptic number.

81105006 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81105006 is a wasteful number, since it uses less digits than its factorization.

81105006 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13517506.

The product of its (nonzero) digits is 240, while the sum is 21.

The square root of 81105006 is about 9005.8317772430. The cubic root of 81105006 is about 432.8617593176.

The spelling of 81105006 in words is "eighty-one million, one hundred five thousand, six".